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Sebaceous carcinoma is a rare cutaneous malignancy of sebaceous glands, but it is up to 25-fold more common in immunosuppressed individuals. In this narrative review, we examine the current literature on the pathogenesis, incidence, risk factors, prognosis, treatment, and surveillance of sebaceous carcinoma in immunosuppression and highlight practical considerations for providers who care for these patients. Increased incidence may be related to decreased immune surveillance, susceptibility to an unknown viral trigger, microsatellite instability, immunosuppressive medications, and unmasking of occult Muir-Torre Syndrome. Risk factors include type of immunosuppression, specific immunosuppressive medications and duration of treatment, and extensive solar damage. Prognosis may be similar to the general population, though data are conflicting. Treatment for primary sebaceous carcinoma is generally surgical, though in patients with high-risk tumors, adjuvant therapy may be advisable. Immunosuppressed patients should have regular screening skin exams, and those with a history of sebaceous carcinoma should have more frequent checks. Providers may consider genetic testing for patients with other features suggestive of occult Muir-Torre Syndrome. If found to have germline Muir-Torre Syndrome mutations, these patients require more rigorous surveillance. [ABSTRACT FROM AUTHOR]

Canine apolipoprotein A‐I (ApoA‐I) amyloidosis has only been reported as an age‐related pulmonary vascular condition. In this report, the authors identified cutaneous ApoA‐I amyloidosis within a fibroadnexal hamartoma in a dog. Based on proteomic analysis using mass spectrometry, the mechanism of ApoA‐I amyloidogenesis is discussed. [ABSTRACT FROM AUTHOR]

Supramolecular extracellular matrix (ECM) networks play an essential role in skin architecture and function. Elastin microfibril interface-located proteins (EMILINs) comprise a family of three extracellular glycoproteins that serve as essential structural components of the elastin/fibrillin microfibril network, and exert crucial functions in cellular signaling. Little is known about the structural nature of EMILIN networks in skin. We therefore investigated the spatiotemporal localization of EMILIN-1, -2, -3 in human skin induced by aging, UV-exposure, fibrosis, and connective tissue disorder. Confocal immunofluorescence and immunogold electron microscopy analysis identified all EMILINs as components of elastic fibers and elastin-free oxytalan fibers inserted into the basement membrane (BM). Further, our ultrastructural analysis demonstrates cellular contacts of dermally localized EMILIN-1 positive fibers across the BM with the surface of basal keratinocytes. Analysis of skin biopsies and fibroblast cultures from fibrillin-1 deficient Marfan patients revealed that EMILINs require intact fibrillin-1 as deposition scaffold. In patients with scleroderma and the bleomycin-induced murine fibrosis model EMILIN-2 was upregulated. EMILIN-3 localizes to the tips of candelabra-like oxytalan fibers, and to specialized BMs engulfing hair follicles and sebaceous glands. Our data identify EMILINs as important markers to monitor rearrangements of the dermal ECM architecture induced by aging and pathological conditions. [ABSTRACT FROM AUTHOR]

PRAME (PReferentially expressed Antigen in MElanoma) is a tumor-associated antigen first identified in tumor-reactive T-cell clones derived from a patient with metastatic melanoma. Immunohistochemistry (IHC) for PRAME is useful for diagnostic purposes to support a suspected diagnosis of melanoma. Anecdotally, PRAME has been observed to stain sebaceous units in glands in background skin. We examined the expression of PRAME in adnexal lesions and common skin cancers to determine whether it is of potential diagnostic utility in supporting the differentiation between sebaceous and non-sebaceous lesions. IRB approval from Mount Sinai Medical Center (MSMC) was obtained. This is a single-center retrospective cohort analysis over a ten-year period (1 January 2012, and 31 December 2023). We used the pathological database of skin lesions, including sebaceous, sweat gland, and follicular lesions, in addition to basal cell carcinomas (BCCs) and squamous cell carcinomas (SCCs), from 81 patients who underwent shave/punch biopsies or surgical excisions. We evaluated the IHC staining percentage positivity and intensity for PRAME. Staining intensity was subcategorized into negative, weak, moderate, and strong, whereas expression percentage positivity was subcategorized into 0%, 1–25%, 26–50%, 51–75%, and 76–100%. Most sebaceous versus non-sebaceous lesions exhibited cytoplasmic staining of moderate to strong intensity in >75% of cells. PRAME has a sensitivity and specificity of 100.0% and 86.7%, respectively, to support distinguishing between sebaceous and non-sebaceous adnexal lesions (regardless of whether they are benign or malignant). BCCs and SCCs showed weak to moderate nuclear staining for PRAME in >75% of cells. None of the 13 lesions of hair follicle origin showed any staining. A total of 26 of the 32 lesions of sweat gland origin were negative while 6 (18.75%) showed positive staining. In conclusion, we confirm the potential utility of PRAME for supporting the distinction between sebaceous and non-sebaceous adnexal lesions on one hand, and on the other, distinguishing BCC and SCC that may show nuclear staining from sebaceous carcinoma that shows cytoplasmic staining. [ABSTRACT FROM AUTHOR]

Background: Acne vulgaris is a common inflammatory skin disease that occurs during puberty, affecting approximately 85% of young adults and may persist into adulthood. The pathophysiology of acne is multifactorial, involving hormonal, inflammatory, and immune mechanisms. Isotretinoin is widely used for treating severe cystic acne or recurrent acne. This medication is considered a pharmacological option that significantly reduces sebum secretion, leading to a reduction in the size of sebaceous glands. It also induces a lack of differentiation in sebaceous cysts, resulting in a decrease in lipid accumulation. Method: This research is a prospective study. Patient contact details were obtained directly from those visiting the dermatology clinic, and they were monitored for a duration of 3 months. Essential data was gathered through patient examinations and inquiries at the clinic, including the prescription of tests prior to initiating isotretinoin treatment. Furthermore, follow‐up tests and examinations were performed within the initial and third months post‐treatment commencement. Results: Sixty‐two patients participated in the study, selected through non‐probability (convenience) sampling. The therapeutic dose taken by patients was 20 mg of isotretinoin daily (n = 49) or every other day (n = 13). Among the participants, six patients experienced a decrease of 3 units or more in HDL levels, while 16 patients saw an increase of 3 units or more in LDL levels, 3 months after beginning the treatment. Additionally, the triglyceride (TG) levels increased by 9 units or more in six individuals, and the blood sugar (BS) levels increased by 5 units or more in nine individuals, 3 months after treatment initiation. Moreover, one person's waist circumference increased by 1.5 cm 3 months after treatment began. The average weight of the individuals at the end of the treatment rose from 60.74 kg to 61.12 kg. However, this weight increase was not statistically significant. (p > 0.05). Conclusion: In general, the results of our study show that the use of oral isotretinoin as a treatment option for the management of acne vulgaris can be effective when administered at the correct dosage, offering a safe and low‐complication option. [ABSTRACT FROM AUTHOR]

Acne is a common chronic inflammatory disorder of the sebaceous gland in the hair follicle. Commonly used external medications cause skin irritation, and the transdermal capacity is weak, making it difficult to penetrate the cuticle skin barrier. Hair follicles can aid in the breakdown of this barrier. As nanomaterials progress, polymer-based nanocarriers are routinely used for hair follicle drug delivery to treat acne and other skin issues. Based on the physiological and anatomical characteristics of hair follicles, this paper discusses factors affecting hair follicle delivery by polymer nanocarriers, summarizes the common combination technology to improve the targeting of hair follicles by carriers, and finally reviews the most recent research progress of different polymer nanodrug-delivery systems for the treatment of acne by targeting hair follicles. [ABSTRACT FROM AUTHOR]

Background: Sebaceous adenitis (SA) is an immune‐mediated disease targeting the sebaceous glands. Meibomian gland dysfunction is a disease affecting meibomian glands with inflammatory features. Sebaceous and meibomian glands share anatomical, physiological and embryological similarities. The involvement of meibomian glands in dogs with SA is currently unknown. Objectives: To evaluate meibomian glands in dogs affected by SA and compare them with healthy dogs. Animals: Eighteen dogs were enrolled. Nine dogs with SA were retrospectively identified from clinical records and represented the case group. Nine healthy, breed‐ and age‐matched dogs were prospectively enrolled in the control group. Materials and Methods: Both groups underwent dermatological examination, Schirmer tear test‐1 (STT‐1), tear meniscus height (TMH), slit‐lamp biomicroscopy, interferometry (INT) and noncontact infrared meibography (NIM). Results: One third of SA dogs presented subepithelial crystalline opacities. No significant difference between groups was observed in TMH (p = 0.944) and STT‐1 values (p = 0.066). INT (p = 0.016) and NIM grades (p = 0.010) were significantly higher and lower in the SA group compared to the control group, respectively. INT values decreased with age (η = 0.930), while NIM scores (η = 0.935) increased. Conclusions: Clinical Relevance: Subepithelial crystalline opacities in SA dogs might reflect a reduced tear film quality. In the absence of standardised methods, INT and NIM proved to be noninvasive and useful methods to examine meibomian glands. Dogs with SA showed a thinner lacrimal lipid layer and more severe meibomian gland abnormalities than control dogs, which seemed to progress with age. [ABSTRACT FROM AUTHOR]

Inflammatory skin diseases impose a significant burden on patients and healthcare systems worldwide. Among these, hidradenitis suppurativa (HS) is particularly notable for its chronic and recurrent nature. Recurrent nodules, abscesses, and scarring in apocrine gland-rich areas characterize the disease, including the groin, axillae, and perianal regions. Despite its considerable physical and psychological impact, the precise mechanisms driving HS remain elusive. Recent advancements in understanding the inflammatory processes involved in HS have highlighted the TNF-alpha, IL-1β, and IL-17/IL-23 pathways, which play crucial roles in initiating and perpetuating the disease. Moreover, specific microRNAs (miRNAs), such as miR-24-1-5p, miR146a-5p, mirR-26a-5p, miR-206, miR-338-3p, and miR-338-5p, are involved in these inflammatory processes. Dysregulation of these miRNAs contributes to aberrant cytokine expression and persistent inflammation, foreseeably exacerbating HS disease progression. This narrative review hypothesizes that miRNA dysregulation triggers aberrant expression in specific inflammatory pathways, contributing to HS's clinical manifestations and progression. We explore the implicated miRNAs' potential as biomarkers for earlier disease detection and as novel therapeutic targets. Identifying miRNA dysregulation offers new opportunities for earlier and more accurate diagnosis, potentially allowing clinicians to intervene before severe disease manifestations occur. Furthermore, therapeutic strategies to modulate miRNA expression could target the inflammatory pathways driving HS, leading to more personalized and effective treatments. This review also discusses future research directions to enhance the clinical management of HS. A better understanding of miRNA involvement in HS offers new avenues for research and management, ultimately improving patient outcomes and quality of life. [ABSTRACT FROM AUTHOR]

Background: Extra ocular sebaceous carcinoma is a very rare, aggressive, malignant tumor arising in the adnexal epithelium of sebaceous gland that account for only about 25% of all sebaceous carcinomas (Wick et al. in Cancer 56(5):1163–72, 1985). The diagnosis of this tumor is difficult because its clinical appearance is atypical. The common treatment consists in wide local excision of the lesion with removal of local lymph node. We report the second case of sebaceous carcinoma involving the back. It was treated with surgical excision and sentinel lymph node biopsy. Case presentation: A 69 year-old Caucasian woman presented with an erythematous, violaceus and exophytic lesion with central ulceration and leakage of purulent material in dorsal region at the level of T10–T11, measuring 7 × 6 cm in size. A biopsy of the lesion reported a moderately differentiated sebaceous carcinoma with lymph, vascular and perineural invasion. Extension studies revealed axillary lymphadenopathy and a renal lesion suggestive of angiomyolipoma based on tomographic findings. A biopsy of the axillary lymphadenopathy was performed, which was negative for malignancy. A wide excision of the lesion with a 2 cm margin and sentinel lymph node biopsy were performed. On histopathological examination was confirm the diagnosis of sebaceous carcinoma of the back. The patient had a good clinical course, and it was decided to follow up clinically every 6 months. Conclusion: Sebaceous carcinoma can occur in locations other than the ocular region. It is frequently difficult to diagnose and has an unpredictable prognosis. The back is a particularly unusual site for this lesion. Surgery remains the mainstay of treatment, and a sentinel lymph node biopsy can be performed instead of removing all regional lymph nodes. [ABSTRACT FROM AUTHOR]

Background: We present this case to highlight the importance of considering seromucinous hamartoma in the differential diagnosis of nasal cavity lesions, particularly due to its rarity and potential for being mistaken for more aggressive pathologies. Seromucinous hamartoma, although benign, can exhibit clinical and histological features that overlap with those of malignant tumors, posing a diagnostic challenge. This case is especially noteworthy due to the unusual presentation of sebaceous differentiation within seromucinous hamartoma, a feature not previously documented in the literature. Recognizing such rare entities is crucial for ensuring appropriate patient management and avoiding unnecessary interventions. Case presentation: We report a unique case of a 41-year-old Caucasian man with seromucinous hamartoma, presenting with chronic left nasal obstruction and recurrent mild epistaxis. Nasal endoscopy revealed a well-defined, multilobulated lesion in the left nasal cavity. Computed tomography scans confirmed an anteromedial polypoid lesion, 31 mm × 15 mm. The lesion was endoscopically resected without complications, with no recurrence at 6-month follow-up. Pathological examination showed a filiform polypoid lesion with clusters of seromucinous glands, ducts, and tubules, and no invasive growth patterns. Immunohistochemical studies revealed distinct epithelial membrane antigen (EMA) and p63 staining patterns. Notably, mature sebaceous gland formation interspersed with seromucinous glands was observed, a novel finding in seromucinous hamartoma. Recognizing seromucinous hamartoma is crucial to avoid unnecessary treatments, and it should be included in differential diagnoses of nasal cavity lesions. Conclusion: Seromucinous hamartoma is a rare and benign nasal cavity lesion that presents significant diagnostic challenges due to its potential to mimic more aggressive pathologies. This case highlights the importance of including seromucinous hamartoma in the differential diagnosis of sinonasal lesions, particularly when unusual histological features, such as sebaceous differentiation, are present. [ABSTRACT FROM AUTHOR]

The sebaceous gland (SG) is a vital appendage of the epidermis, and its normal homeostasis and function is crucial for effective maintenance of the skin barrier. Notch signaling is a wellknown regulator of epidermal differentiation, and has also been shown to be involved in postnatal maintenance of SGs. However, the precise role of Notch signaling in regulating SG differentiation in the adult homeostatic skin remains unclear. While there is evidence to suggest that Notch1 is the primary Notch receptor involved in regulating the differentiation process, the ligand remains unknown. Using monoclonal therapeutic antibodies designed to specifically inhibit of each of the Notch ligands or receptors, we have identified the Jag2/Notch1 signaling axis as the primary regulator of sebocyte differentiation in mouse homeostatic skin. Mature sebocytes are lost upon specific inhibition of the Jag2 ligand or Notch1 receptor, resulting in the accumulation of proliferative stem/ progenitor cells in the SG. Strikingly, this phenotype is reversible, as these stem/progenitor cells re-enter differentiation when the inhibition of Notch activity is lifted. Thus, Notch activity promotes correct sebocyte differentiation, and is required to restrict progenitor proliferation. [ABSTRACT FROM AUTHOR]

The article discusses the use of Ultraviolet Reflectance Dermoscopy (UVRD) in dermatological examinations, highlighting its applications in diagnosing various skin conditions such as vitiligo, melasma, and acne vulgaris. UVRD can enhance the visualization of pigmentary patterns, sebaceous gland openings, and scabietic burrows, aiding in the diagnosis and follow-up of these conditions. Additionally, UVRD can be useful in evaluating premature canities, regrowing hairs in alopecia areata, and identifying features like the UV blink sign in seborrheic keratosis. The integration of dermoscopy with UV light offers a promising tool for diagnostic dermatology, providing clearer insights into skin conditions under magnification with UV light. [Extracted from the article]

Background: Caruncular sebaceous gland hyperplasia (SGH) is an uncommon, benign lesion. Its cause is still unclear. It has not been reported in the pediatric population, with few cases diagnosed in the fourth to eighth decades of life. Case Report: A 6-year-old boy presented with a slowly growing caruncular mass in the right eye. A diagnosis of caruncular SGH was made by histopathology. The clinical, histopathology, treatment, and prognosis are reviewed. Conclusion: This is the first described pediatric case of caruncular SGH that occurs since birth. There are many similarities between adult and pediatric caruncular SGH. Surgical excision is the recommended treatment. [ABSTRACT FROM AUTHOR]

Background/Aim: Ovarian tumors are a common type of neoplasm in women, with mature cystic teratomas being the most frequent variant. These tumors occur bilaterally in approximately 10% of cases. However, bilateral and multiple occurrences are rarely reported. Case Report: A 22-year-old nulliparous woman presented with amenorrhea and sudden, generalized, dull lower abdominal pain. Diagnostic imaging, including ultrasound and computed tomography (CT) scans, revealed large solid-cystic lesions in both ovaries, with internal hyperechoic foci consistent with fat and calcification, along with thin internal septations. A laparoscopic cystectomy was successfully performed, preserving ovarian function. Histopathological examination confirmed the presence of stratified keratinized squamous epithelium, sebaceous glands, hair follicles, mature adipose tissue, blood vessels, and lymphatic vessels within the resected cysts, with no evidence of malignancy. Conclusion: This unique case provides valuable insights into the understanding and management of bilateral dermoid cysts, highlighting the importance of preserving ovarian function in young women. [ABSTRACT FROM AUTHOR]

Background: Hidradenitis suppurativa, also called acne inversa, is a chronic skin inflammatory condition involving hair follicles, sebaceous glands, and apocrine glands. Symptoms can be variable in intensity, ranging from mild to severe. The exact causes of hidradenitis suppurativa are not fully understood, but the etiology is presumed to be multifactorial, encompassing genetics and environmental factors. Methods: Two families presented with hidradenitis suppurativa with an autosomal dominant pattern. We performed whole-exome sequencing in two unrelated patients from the two families. Results: We identified two and three variants in the two families, respectively. Variants involved the TLR2 and MPO genes in the first family and the MMP2, GJB2, and TLR4 genes, some of which have already been previously reported as possible candidates for hidradenitis suppurativa. Conclusion: It is very likely that variants in a single gene only rarely cause the condition and that most cases, especially familial hidradenitis suppurativa cases, may more probably take the form of polygenic disorders. [ABSTRACT FROM AUTHOR]

The sebum on human skin is generated for various causes. The composition of the formed sebum increases the proliferation of Cutibacterium acnes (C. acnes) residing on the skin. As C. acnes proliferates, it produces skin irritants that stimulate the sebaceous glands, increasing sebum production. Skin troubles such as acne may occur. The lysate concentrates of Bacillus stratosphericus (B. stratosphericus), first discovered in the stratosphere, confirmed a 66.35% inhibition of Nitric Oxide (NO) production at 0.50 mg/ml concentration in vitro. Additionally, the growth inhibition efficacy of B. stratosphericus lysate concentrate (BSLC) against C. acnes was confirmed, showing a 95.1% inhibition of growth proliferation at a consistency of 0.50 mg/ml. Based on the in vitro results, the efficacy of BSLC in degrading and reducing sebum was confirmed by reacting it with artificial sebum to various concentrations. The results showed a concentration-dependent decrease in artificial sebum ccording to the efficacy results confirmed in vitro, a clinical trial was conducted to evaluate the daily sebum reduction efficacy of a serum formulation containing 50 mg/ml of BSLC. After a 4-week application, the test group containing BSLC determined a significant 28.68% reduction in sebum levels, demonstrating the practical implications of the research. In conclusion, BSLC is considered to have sufficient industrial value as a valuable ingredient for the cosmetics industry aimed at sebum improvement. [ABSTRACT FROM AUTHOR]

Abstract Sebaceous glands (SG) are essential for maintaining skin integrity, as their lipid-rich secretion (sebum) lubricates and protects the epidermis and hairs. In addition, these glands have an emerging role in immunomodulation and may affect whole-body energy metabolism, besides being an appealing model for research in topics as lipogenesis, stem cell biology and tumorigenesis. In spite of the increasing interest in studying SGs pathophysiology, sebocyte cell–cell and cell–matrix adhesion processes have been only superficially examined, and never in a systematic way. This is regrettable considering the key role of cellular adhesion in general, the specific expression pattern of indivdual junctional complexes, and the reports of structural changes in SGs after altered expression of adhesion-relevant proteins. Here, we review the available information on structural and functional aspects of cell–cell and cell–matrix junctions in sebocytes, and how these processes change under pathological conditions. This information will contribute for better understanding sebocyte differentiation and sebum secretion, and may provide hints for novel therapeutic strategies for skin diseases.

Soo Il Chun Chun Aesthetic and Laser Clinic, Seoul, South KoreaCorrespondence: Soo Il Chun, Chun Aesthetic and Laser Clinic, 91-2, Geumnanghwa-ro, Gangseo-gu, Seoul, Republic of Korea, Tel +82106267 8847, Email chun21@netsgo.comBackground and Aims: Acne vulgaris remains one of the most common and problematic dermatological conditions. Recently, a fractional 1927 nm thulium laser has been developed with specific water absorption characteristics which may be of interest in the treatment of acne.Subjects and Methods: Nine consecutive Korean subjects, 6 females and 3 males, ages ranging from 13 to 33 yr, presented with a mixture of inflammatory and noninflammatory acne. Baseline clinical photography, image analysis and lesion counts were performed. A fractional 1927 nm thulium laser (FTL) delivered 6 treatment sessions in 5 subjects and 5 sessions in 4 subjects, 4 weeks between sessions. Pain during treatment was assessed. At 32 weeks after the last treatment session, an independent Investigator Global Assessment (IGA) performed lesion counts and graded the severity of the acne at baseline and the final assessment on a quintile scale. Data were analyzed statistically.Results: All 9 subjects completed the study with significant reductions in the inflammatory and noninflammatory lesions (P values 0.0012 and 0.0081, respectively) with overall lesion counts at the final assessment ranging from 60% to 97.1%, and acne grades in the IGA dropping by an average of 1.67 (range 1 to 3 grades). There was no significant difference in lesion counts or acne grades between the subjects who had 6 treatments and those who had 5 (P = 0.7695). Mild pain was reported during treatment, and no adverse events were reported by either the subjects or investigator.Conclusions: The FTL at the parameters used in the present study caused disruption to the upper portion of the affected follicles and sebaceous glands under an intact stratum corneum, thereby destroying or damaging the causative Cutibacterium acnes. The superficial controlled coagulation additionally induced follicular remodeling and tissue regeneration, potentially contributing to the noticeable results in inflammatory and noninflammatory acne lesions.Keywords: Cutibacterium acnes, thulium laser, infundibulum, sebaceous glands, follicular remodeling, selective photothermolysis

The epidermis of the skin and skin appendages, such as nails, hair and sebaceous glands, depend on a balance of cell proliferation and terminal differentiation in order to fulfill their functions at the interface of the body and the environment. The differentiation of epithelial cells of the skin, commonly referred to as keratinocytes, involves major remodeling processes that generate metabolically inactive cell remnants serving as building blocks of the epidermal stratum corneum, nail plates and hair shafts. Only sebaceous gland differentiation results in cell disintegration and holocrine secretion. A series of studies performed in the past decade have revealed that the lysosome-dependent intracellular degradation mechanism of autophagy is active during keratinocyte differentiation, and the blockade of autophagy significantly alters the properties of the differentiation products. Here, we present a model for the autophagy-mediated degradation of organelles and cytosolic proteins as an important contributor to cellular remodeling in keratinocyte differentiation. The roles of autophagy are discussed in comparison to alternative intracellular degradation mechanisms and in the context of programmed cell death as an integral end point of epithelial differentiation. [ABSTRACT FROM AUTHOR]

Introduction: Histologically, tumours of the epidermal appendages have been classified into four groups that exhibit histologic features analogous to hair follicles, sebaceous glands, apocrine glands, and eccrine glands. Aim: To investigate the histomorphological spectrum and distribution of Skin Adnexal Tumours (SATs). Materials and Methods: This observational descriptive crosssectional study was conducted over a period of five years, from August 2017 to July 2022, in the Department of Pathology at Pt. JNMMC Raipur, Chhattisgarh, India. All histologically diagnosed cases of SATs in the pathology department during this period were included, along with relevant data such as age, sex, anatomical location of tumours, and clinical diagnosis. Results were presented in the form of frequency distribution in terms of numbers and percentages. Results: Out of a total of 51 SATs, the male-to-female ratio was 1:1.3, indicating a female preponderance. The highest number of cases was observed in the age group of 41-60 years, comprising 17 cases (33.3%). Benign tumours accounted for 35 cases (68.63%), while malignant tumours comprised 16 cases (31.37%). Tumours associated with hair follicles were the most common, with 25 cases (49.02%). The head and neck region was the most common site for SATs, comprising 30 cases (58.82%). Pilomatrixoma was the most common benign SAT, constituting 13 cases (25.49%). Among malignant SATs, sebaceous carcinoma was the most prevalent, comprising seven cases (13.73%). Conclusion: SATs present a diagnostic challenge for both clinicians and pathologists due to their diverse clinical presentations and overlapping histopathological features. While most SATs are benign, their malignant counterparts, although rare, have an aggressive course with metastatic potential and poor outcomes. Therefore, early detection of malignant SATs is crucial. Present study emphasised that histopathological examination is the gold standard for establishing early diagnosis and enabling appropriate therapeutic intervention. [ABSTRACT FROM AUTHOR]

Targeted drug delivery has emerged as a transformative approach in the treatment of periorbital skin malignancies, offering the potential for enhanced efficacy and reduced side effects compared to traditional therapies. This review provides a comprehensive overview of targeted therapies in the context of periorbital malignancies, including basal cell carcinoma, squamous cell carcinoma, sebaceous gland carcinoma, and Merkel cell carcinoma. It explores the mechanisms of action for various targeted therapies, such as monoclonal antibodies, small molecule inhibitors, and immunotherapies, and their applications in treating these malignancies. Additionally, this review addresses the management of ocular and periocular side effects associated with these therapies, emphasizing the importance of a multidisciplinary approach to minimize impact and ensure patient adherence. By integrating current findings and discussing emerging trends, this review aims to highlight the advancements in targeted drug delivery and its potential to improve treatment outcomes and quality of life for patients with periorbital skin malignancies. [ABSTRACT FROM AUTHOR]

Sebaceous carcinoma (SC) is a rare neoplasm affecting periocular and extraocular sites. If inadequately treated, it can recur and cause morbidity. Specific management guidelines have not been established. Wide local excision (WLE) has been traditionally used; however, Mohs micrographic surgery (MMS) can be advantageous because of complete margin assessment and tissue‐sparing nature. This analysis aims to systematically review the surgical modalities used for the management of SC. Articles meeting eligibility criteria were identified using MEDLINE (via PubMed), Embase, Cochrane, and Scopus databases. All studies investigating surgical management of SC with WLE or MMS were considered. Seventy studies met inclusion criteria, including retrospective cohort studies, case series, and case reports. WLE was used in 32 studies, MMS in 29, and MMS and WLE in 9. Subgroup analysis showed that MMS has lower recurrence rates. For WLE, local, regional, and distant recurrence rates were 23.4%, 13.3%, and 11.0%, respectively, and for MMS, 6.8%, 4.3%, and 4.6%, respectively. Patients treated with WLE were more likely to have local recurrence than patients treated with MMS (P = 0.001). WLE cases were more likely to have a regional (P = 0.05) and distant recurrence (P = 0.001). Limitations of the study include heterogeneity of case reports, case series, and retrospective studies, variable follow‐up times between the two groups, and large tumors included in the WLE category. In addition, disease‐specific survival was not evaluated. MMS cases showed a superior outcome for local, regional, and distant recurrence, making it a good option for the management of SC. [ABSTRACT FROM AUTHOR]

Background: Acne vulgaris (AV) is a widespread inflammatory skin condition associated with increased sebum production, abnormal keratinization, bacterial overgrowth, and inflammation. Overactive sebaceous glands (SGs) produce excess sebum, promote Cutibacterium acnes growth, and affect acne development. Energy‐based treatments (EBDs), including light therapy, photodynamic therapy (PDT), lasers, and radiofrequency (RF) devices, have emerged as effective treatment options. As the use of EBDs becomes more widespread, it is imperative to understand their effects on skin parameters, such as sebum, in AV. Methods: Searches were conducted in Embase, PubMed, Web of Science, and the Cochrane Library. The studies included were randomized and nonrandomized trials on facial AV that used EBDs and featured objective casual sebum level (CSL) measurements via Sebumeter. Data synthesis involved percentage reductions in CSL at follow‐ups compared to baseline. Results: Twenty‐three studies were analyzed. PDT and RF consistently reduced CSL by 30%–40% and 30%–35%, respectively. Laser therapy showed lesser reductions, whereas light therapy varied significantly and studies had a high risk of bias. All EBD therapies were more effective than no treatment and PDT was superior to light monotherapy. Laser therapy combined with fractional microneedling radiofrequency (FMR) or as a standalone was more effective than laser alone. Conclusion: Noninvasive sebum measurement provides valuable insights into AV treatment efficacy. PDT, lasers, especially the 1450‐nm diode laser, and FMR are promising for reducing sebum. Standardization of measurement techniques and further research are vital for enhancing treatment personalization, reducing side effects, and improving AV management. [ABSTRACT FROM AUTHOR]

The role of aquaporin proteins (AQPs) in tumor biology has attracted attention over the past 20 years. However, the expression profiles of AQPs in canine sebaceous gland tumors remain obscure. This study was performed to clarify the expression of AQP1, 3, 5, the most studied AQPs in tumor biology, in sebaceous adenoma and sebaceous epithelioma. Among these AQPs, only AQP3 was expressed in normal tissue and both tumor types and located to only undifferentiated sebocytes (basaloid cells). A cellular proliferation marker, Ki-67, was detected only in the area including basaloid cells in both tumor types. These findings suggest that AQP3 is useful for clarifying the origin of sebaceous gland tumors, and that AQP3 may be related to sebaceous gland development. [ABSTRACT FROM AUTHOR]

Insulin-like growth factor-1 (IGF-1) is considered as a pathogenic factor contributing to sebaceous gland dysfunction, which leads to acne vulgaris. Paeoniflorin (Pae), a bioactive monomer derived from total glycosides of paeony, has shown potential in treating various diseases. However, its anti-acne effects on human sebocytes are not well understood. In this study, we investigated the effects of Pae on acne development induced by IGF-1 in SZ95 sebocytes. Following IGF-1 stimulation, SZ95 sebocytes were exposed to Pae and then determined for proliferation, cell cycle, apoptosis, lipogenesis and pro-inflammatory cytokine secretion. We also analyzed the expression of proteins involved in the PI3K/Akt/FoxO1 and JAK2/STAT3 pathways. In vitro experiments demonstrated that Pae significantly inhibited colony formation, induced G1/S cell cycle arrest, promoted apoptosis, inhibited lipogenesis and cytokine synthesis in IGF-1-treated SZ95 sebocytes. Furthermore, Pae suppressed the phosphorylation of Akt, FoxO1, JAK2, and STAT3. Importantly, the sebo-suppressive and anti-inflammatory effects of Pae were enhanced by blocking PI3K and JAK2. In summary, our findings suggest that Pae has potent anti-proliferative and pro-apoptotic effects in SZ95 sebocytes. Additionally, Pae effectively protects against IGF-1-induced lipogenesis and inflammation by targeting the PI3K/Akt/FoxO1 and JAK2/STAT3 signaling pathways. [ABSTRACT FROM AUTHOR]

Acne vulgaris, commonly known as acne, is the most prevalent skin disorder affecting mainly adolescents and young adults, though it can affect people of all ages, making it the most common complaint by patients presenting to a dermatologist. The overactivity of sebaceous glands primarily drives this skin condition due to androgen influence and the presence of Cutibacterium acnes bacteria. Although typically not directly harmful to patient health, acne can be a highly debilitating disease for patients, affecting their self-image and psychosocial well-being. Standard treatments include topical retinoids, benzoyl peroxide, topical antibiotics, and, for more severe cases, systemic antibiotics or isotretinoin, which require prolonged periods of compliance. All these pharmacologic treatments have a risk of side effects ranging from mild ones, like skin irritation and dryness, to severe ones, like depression. Thus, there is a demand for exploring other treatment modalities in treating acne, and laser and light-based therapies have garnered significant interest. This review article will comprehensively assess emerging laser and other light-based therapies that have shown efficacy in treating acne, including the recently FDA-approved 1,726 nm laser. [ABSTRACT FROM AUTHOR]

Sebaceous glands (SG) are essential for maintaining skin integrity, as their lipid-rich secretion (sebum) lubricates and protects the epidermis and hairs. In addition, these glands have an emerging role in immunomodulation and may affect whole-body energy metabolism, besides being an appealing model for research in topics as lipogenesis, stem cell biology and tumorigenesis. In spite of the increasing interest in studying SGs pathophysiology, sebocyte cell–cell and cell–matrix adhesion processes have been only superficially examined, and never in a systematic way. This is regrettable considering the key role of cellular adhesion in general, the specific expression pattern of indivdual junctional complexes, and the reports of structural changes in SGs after altered expression of adhesion-relevant proteins. Here, we review the available information on structural and functional aspects of cell–cell and cell–matrix junctions in sebocytes, and how these processes change under pathological conditions. This information will contribute for better understanding sebocyte differentiation and sebum secretion, and may provide hints for novel therapeutic strategies for skin diseases. [ABSTRACT FROM AUTHOR]

Introduction and purpose Acne is one of the most common dermatological conditions, especially in adolescents. The etiology of acne is complex, and many factors influence the formation of lesions. Local inflammation, a proliferation of Propionibacterium acnes, hormonal influences with particular importance of androgens, hyperkeratinization, and excessive sebum production are essential in the pathogenesis. The factors stimulating these processes are complex and not always clear. Therefore, in our work, we focused on investigating the connection between a high-glycemic diet and the formation of acne lesions. The state of knowledge The link between diet and acne has been only mentioned in the literature for many years. However, the development of science has made it possible to understand the exact pathogenesis of acne and the relationship of acne lesions to specific dietary components. Of all the diet products, a high glycemic index diet stands out as the one with the most significant impact. Foods with a high glycemic index, i.e. those with a high amount of simple sugars, through an increase in the expression of factors such as insulin, IGF-1 cause excessive sebum production in the sebaceous glands and even an increase in inflammatory infiltration, which further exacerbates acne lesions. In the following review paper, we have looked at the metabolic pathways and hormonal changes that link the consumption of high glycemic index foods to the formation of acne lesions and described several original papers that unequivocally demonstrate the critical role of this diet on acne formation. Summary Based on the literature, we emphasize that in acne treatment, it is necessary not only to focus on medications but, above all, to look at the patient holistically, modifying the lifestyle with particular importance on modifying the patient's diet by lowering its glycemic index. [ABSTRACT FROM AUTHOR]

Background: Acne vulgaris poses a significant dermatological challenge, necessitating alternative treatments due to limitations and side effects associated with current therapies. This pilot clinical trial investigated the feasibility and efficacy of precision cryotherapy for acne vulgaris. Methods: A total of 20 volunteers underwent targeted precision cryotherapy using a carbon dioxide‐based device. Treatment outcomes were assessed using various parameters, including Investigator Global Assessment (IGA) score, acne lesion count, erythema index (EI), global evaluation score, and participant satisfaction. Safety monitoring included adverse event reporting and physical examination. Results: Precision cryotherapy demonstrated a significant reduction (90.25%) in the acne lesion count by week 4, with clinical improvement indicated by IGA score reduction (p < 0.001). The EI showed notable improvements at weeks 1, 2, and 4. The global evaluation score demonstrated a 75%–100% clinical improvement at Visit 4. Participants reported high satisfaction (6.75 ± 0.79) with the procedure. No adverse event or discomfort was reported. Conclusion: Precision cryotherapy effectively improved acne lesions, which was safe and satisfactory for participants. These findings suggest its potential as an alternative therapeutic modality, especially for populations with limited treatment options. Further research is needed to validate the results and explore underlying mechanisms. [ABSTRACT FROM AUTHOR]

The present study was executed at Department of Veterinary Anatomy, College of Veterinary Science, Sri Venkateswara Veterinary University, Tirupati, Andhra Pradesh, India during the period of July, 2020 to October, 2021 to find the possible differences in histology of teat among domestic animals. The study was conducted on teat of domestic animals i.e., 6 adult buffalo, 6 cattle, 15 sheep, 15 goats, 6 dogs and 6 pigs. The wall of the teat consisted of three layers in buffalo, cattle, sheep, goat and pig i.e., outer skin, middle muscular and inner connective tissue layer. But in dog only two layers were present i.e., outer skin and inner fibromuscular layer. Each teat consisted of single teat sinus in buffalo, cattle, sheep and goat, whereas in pig each teat showed two teat sinuses and eleven sinuses in dog. In buffalo and cattle, isolated clusters of glandular structures were seen between the smooth muscle fibers which were absent in sheep, pig and dog. Further, in sheep and goat, accessory glands were noted in the dermis and in middle layer. Sweat glands were noticed only in sheep and goat. In cattle and pig, hair follicles were not distinct and they were surrounded by numerous sebaceous glands. The number of collagen fibers in dermis of teat were more dense in cattle than other domestic animals. Elastic fibers were numerous in dog and moderate in the dermis of teat in buffalo, cattle, sheep and very few in goat. [ABSTRACT FROM AUTHOR]

The article provides a comprehensive overview of acne vulgaris, focusing on its pathophysiology and management strategies. Topics discussed include factors influencing acne such as androgen activity and genetic variants, the impact of lifestyle and dietary behaviors, and current treatment options ranging from topical and oral medications to isotretinoin.

Acne vulgaris (AV), characterized by excessive sebum production and Cutibacterium acnes proliferation in the sebaceous glands, significantly impacts physical and psychological health. Recent treatment advancements have focused on selective photothermolysis of sebaceous glands. This review evaluates two innovative therapies: the 1726-nm laser and nanoparticle-assisted laser treatments. We conducted a comprehensive search of PubMed and Embase using the primary terms "acne vulgaris" or "acne" AND "laser," "photothermal therapy," "nanoparticles," "treatment," or "1726 nm laser." Inclusion criteria were articles published in English in peer-reviewed journals that focused on treating AV through targeting the sebaceous glands, yielding 11 studies. Gold nanoparticles, used with 800-nm laser, 1064-nm Nd: YAG laser, or photopneumatic device, and platinum nanoparticles with 1450-nm diode laser, showed notable improvements in severity and number of acne lesions, safety, and patient satisfaction. The 1726-nm laser treatments also showed considerable lesion reduction and tolerability, with minimal side effects such as erythema and edema. Its efficiency is credited to its short, high-power pulses that effectively target sebaceous glands, offering precise treatment with fewer side effects compared to lower-power pulses. Selective photothermolysis using nanoparticle-assisted laser therapy or the 1726-nm laser offers a promising alternative to conventional AV treatments, showcasing efficacy and high patient satisfaction. The 1726-nm laser streamlines treatment but involves new equipment costs, while nanoparticle-assisted therapy integrates well into existing setups but relies on external agents and is unsuitable for certain allergies. Future research should include long-term studies and comparative analyses. The choice of treatment modality should consider patient preferences, cost implications, and availability of specific therapies. [ABSTRACT FROM AUTHOR]

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Acne vulgaris is a complex condition involving factors that affect the pilosebaceous unit. A primary manifestation of acne pathology is the development of comedones, often linked to the overproduction of sebum resulting from 5α‐dihydrotestosterone (5α‐DHT) and insulin activity. Ozenoxacin is a topical quinolone that exhibits potent antibacterial activity against Cutibacterium acnes (C. acnes). It is commonly used to treat acne associated with this bacterium; however, its effect on sebum production within the sebaceous glands remains unclear. In this study, the effects of ozenoxacin on sebum production were examined using insulin‐ and 5α‐DHT‐differentiated hamster sebocytes. Ozenoxacin showed a dose‐dependent inhibition of lipid droplet formation and triacylglycerol (TG) production, which is a major component of sebum. In addition, it suppressed the expression of diacylglycerol acyltransferase 1, stearoyl‐CoA desaturase‐1, and perilipin‐1 mRNA, all important factors involved in sebum synthesis, in a dose‐dependent manner. Moreover, ozenoxacin decreased phosphorylated 40S ribosomal protein S6 levels downstream of the mechanistic/mammalian target of rapamycin complex 1 (mTORC1), without altering the phosphorylation of Akt, an upstream regulator of mTORC1, in both insulin‐ and 5α‐DHT‐treated hamster sebocytes. Interestingly, nadifloxacin, but not clindamycin, exhibited a similar suppression of sebum production, albeit with lesser potency compared with ozenoxacin. Furthermore, a topical application of a 2% ozenoxacin‐containing lotion to the auricle skin of hamsters did not affect the size of the sebaceous glands or epidermal thickness. Notably, it decreased the amount of TG on the skin surface. The results provide novel insights into the sebum‐inhibitory properties of ozenoxacin, indicating its potential efficacy in controlling microbial growth and regulating sebum production for acne management. [ABSTRACT FROM AUTHOR]

Objective: This research aims to explore how Puerariae Lobatae Radix regulates sebaceous gland secretion using network pharmacology, and validate its effects on important targets through animal studies. Methods: This study utilized UPLC-EQ-MS to analyze Puerariae Lobatae Radix extract and identify potential bioactive compounds. Predicted targets of these compounds were obtained from the Swiss Target Prediction database, while targets associated with sebaceous gland secretion were obtained from the GeneCards database. Common targets between the databases were identified and a protein-protein interaction (PPI) network was established using the STRING platform. The PPI network was further analyzed using Cytoscape software. Pathway enrichment analysis was performed using Reactome, and molecular docking experiments targeted pivotal pathway proteins. Animal experiments were then conducted to validate the regulatory effects of the primary active compounds of Puerariae Lobatae Radix on key pathway proteins. Results: This research identified 17 active compounds in Puerariae Lobatae Radix and 163 potential targets associated with the regulation of sebum secretion. Pathway enrichment analysis indicates that these targets may modulate lipid metabolism pathways through involvement in peroxisome proliferator-activated receptor α, SREB, steroid metabolism, and arachidonic acid metabolism pathways. Molecular docking analysis demonstrates that puerarin and daidzein show favorable binding interactions with key targets in these pathways. Animal experiments demonstrated that the administration of Puerariae Lobatae Radix resulted in a significant reduction in the area of sebaceous gland patches compared to the control group. Histological analysis revealed notable alterations in the structure of sebaceous glands, including reductions in size, thickness, and density. Furthermore, the expression levels of TG, DHT, and IL-6 were significantly decreased in the Puerariae Lobatae Radix group (p < 0.05), and immunoblotting indicated a significant decrease in the expression of PPARG and ACC1 (p < 0.05). Conclusion: This study demonstrates that Puerariae Lobatae Radix can regulate skin lipid metabolism by targeting multiple pathways. The primary mechanism involves inhibiting sebaceous gland growth and reducing TG secretion by modulating the expression of PPARG and ACC1. Puerarin and Daidzein are identified as key bioactive compounds responsible for this regulatory effect. These findings highlight the therapeutic potential of Puerariae Lobatae Radix in addressing sebaceous gland-related conditions. [ABSTRACT FROM AUTHOR]

Background Methods Results Conclusions Rosacea is a chronic inflammatory disease, and doxycycline is a widely recommended treatment for it due to its anti‐inflammatory action. Oral isotretinoin reduces sebaceous gland activity and modulates toll‐like receptors, reducing inflammation. Our aim was to investigate the effect of these two drugs on the expression of cutaneous immunohistochemical biomarkers related to etiopathogenic factors involved in rosacea.We conducted a randomized, comparative, and evaluator‐blinded trial, including 40 participants with moderate and severe papulopustular and ocular rosacea. Participants were treated with doxycycline (DOXY) 100 mg or isotretinoin (ISO) 0.3 mg/kg daily. Immunohistochemistry at baseline and after 4 months was used to demonstrate the expression of the biomarker on the affected skin.The following changes were detected: a reduction in the vessel count after using VEGF with DOXY (P = 0.010); a decrease in VEGF intensity with ISO (P < 0.001) and DOXY (P = 0.020); a reduction of nitric oxide synthase enzyme with both drugs in the inflammatory infiltrate (ISO P < 0.001; DOXY P = 0.003); however, only with ISO was there a significant (P = 0.030) decrease at the level of the sebaceous glands, indicating a reduction of nitric oxide synthesis; a reduction of TRPV‐1 expression at the level of the sebaceous glands was observed only with DOXY (P = 0.041); a decrease of cathelicidin LL37 expression, a key antimicrobial peptide in the etiopathogenesis of rosacea, was noted with both drugs, although at the level of sebaceous glands, only with DOXY (P = 0.007).Oral isotretinoin and doxycycline have modified the expression of cutaneous biomarkers related to rosacea etiopathogenesis, demonstrating their role in controlling inflammatory and vascular processes. [ABSTRACT FROM AUTHOR]

Background: Acne negatively affects quality of life, however quality‐of‐life scores poorly correlate with disease severity scores. Previous research demonstrated existence of facial areas in which skin lesions have greater impact on gaze patterns. Therefore, we hypothesized that anatomical variants of acne may be perceived differently. Objectives: The aim was to investigate effect of anatomical variants of acne on natural gaze patterns and resulting impact on social perception of acne patients. Methods: We tracked eye movements of participants viewing neutral and emotional faces with acne. Images were rated for acne‐related visual disturbance, and emotional faces were rated for valence intensity. Respondents of an online survey were asked to rate their perception of pictured individuals' personality traits. Results: All faces with acne were perceived as less attractive and received poorer personality judgements with mid‐facial acne presenting smallest deviation from healthy faces. T‐zone and mixed acne exhibited the least significant difference in respondents gaze behaviour pattern from each other. In addition, there was no significant difference in respondents' grading of acne visual disturbance or ratings for attractiveness, success and trustworthiness. U‐zone adult female acne was rated as the most visually disturbing and received the lowest scores for attractiveness. Happy faces with adult female acne were rated as less happy compared to other acne variants and clear‐skin faces. Conclusions: Anatomic variants of acne have a distinct impact on gaze patterns and social perception. Adult female acne has the strongest negative effect on recognition of positive emotions in affected individuals, attractiveness ratings and forming social impressions. If perioral acne lesions are absent, frontal lesions determine impact of acne on social perception irrespective of the presence of mid‐facial lesions. This perceptive hierarchy should be taken into consideration while deciding treatment goals in acne patients, prioritizing achieving remission in perioral and frontal area. [ABSTRACT FROM AUTHOR]

Cattle mange causes extreme itchiness, and the associated stress is an animal welfare concern that leads to economic losses due to decreased cattle productivity and deworming costs. This study investigated the reason why Chorioptic mites, C. bovis and C. texanus, preferentially infest the tail root region (rTR) and performed histological and biochemical analysis focusing on the volatile components of host odors that serve as the starting point for infestation of parasitic arthropods. Skin samples were taken from the rTR, lateral abdominal, and central masseteric, with the latter two designated as comparison sites. The two and three-dimensional histological analysis measured each sebaceous and sweat gland percentage per unit volume. The q-PCR analyzed the expression levels of ALDH1A1 and LOC785756, which are genes associated with volatile odoriferous compounds that serve as repellency and attractive messengers for ticks. Immunohistochemistry stained three sites with anti-androgen binding protein beta-like (ABPβ-like), encoded by LOC785756, antibody. The three-dimensional analysis showed that sebaceous glands in the rTR tend to be more continuous and existed in larger masses than in other regions. The expression level of LOC785756 was significantly higher in the rTR, and immunohistochemistry revealed the presence of ABPβ-like in the sebaceous gland with strong positive signals in the rTR. These results suggest that C. bovis/ texanus selectively infests the rTR because that skin has well-developed sebaceous glands, including a large amount of ABPβ-like, which acts as a mite attractant. [ABSTRACT FROM AUTHOR]

With the prevalence of modern unhealthy lifestyle habits and the worsening of environmental pollution, the occurrence of oily sensitive skin has been increasing. However, the exact cause is still not completely understood. In this paper, we review the definition and characteristics of oily sensitive skin. We also provide an overview of its possible mechanisms, which include excessive sebaceous gland secretion, reduced epidermal barrier function, skin microecological imbalance, inflammatory response, and neurological and vascular hyperreactivity. Furthermore, we analyze the intrinsic connection between these different mechanisms in depth. In response to these mechanisms, this article discusses a series of recommendations for caring for oily sensitive skin. It highlights the differences in skincare compared to dry sensitive skin, emphasizes the importance of choosing effective skincare products, and suggests making adjustments to lifestyle habits. These recommendations aim to improve the quality of life for patients and provide valuable references for practitioners in the field. [ABSTRACT FROM AUTHOR]

Sebaceous glands (SGs) release oils that protect our skin, but how these glands respond to injury has not been previously examined. Here, we report that SGs are largely self-renewed by dedicated stem cell pools during homeostasis. Using targeted single-cell RNA sequencing, we uncovered both direct and indirect paths by which resident SG progenitors ordinarily differentiate into sebocytes, including transit through a Krt5+PPARγ+ transitional basal cell state. Upon skin injury, however, SG progenitors depart their niche, reepithelialize the wound, and are replaced by hair-follicle-derived stem cells. Furthermore, following targeted genetic ablation of >99% of SGs from dorsal skin, these glands unexpectedly regenerate within weeks. This regenerative process is mediated by alternative stem cells originating from the hair follicle bulge, is dependent upon FGFR2 signaling, and can be accelerated by inducing hair growth. Altogether, our studies demonstrate that stem cell plasticity promotes SG durability following injury.

The Acari Hypothesis posits that acarians, i.e., mites and ticks, are causative agents of IgE-mediated conditions. This report further develops The Hypothesis, providing rationale for the childhood predilection of allergy. In short, Malassezia, a fungus native to human skin and utterly dependent on sebaceous lipids, prevents allergy by deterring acarians. Because sebum output is limited before puberty, children are more prone to allergy than are adults. Competition for sebaceous lipids by Staphylococcus aureus influences not only Malassezia number—and, consequently, allergic predisposition—but also lipid homeostasis. The latter, in turn, contributes to dyslipidemia and associated conditions, e.g., the metabolic syndrome.

Eccrine spiradenoma is a rare benign epithelial neoplasm derived from the ductal and secretory portions of the eccrine sweat glands. It is characterized by slow growth and may, in some cases, undergo malignant transformation. This report describes a case involving a male patient with a painful, slow-growing lesion present for 3 years. The nodular, lobulated lesion was located on the left frontal region. Due to the left. On account of location, size, and vascularization of the lesion, as well as the need to preserve the facial musculature and ensure complete tumor removal of the tumor with minimal functional damage, Mohs surgery was chosen as the treatment technique.

Due to its rarity, it takes months for patients to be correctly diagnosed with pemphigus vulgaris. This delay can be exacerbated by factors such as incorrect biopsy site selection. When the epidermis detaches from the dermis, evaluating fluorescence patterns is impossible. This monocentric, retrospective study aimed to assess the clinical significance of the honeycomb-like staining pattern of adnexal structures in patients with pemphigus vulgaris. The study was conducted in Munich, from 1 January 2012 to 31 December 2020. Forty-four biopsy samples for direct immunofluorescence microscopy from pemphigus patients along with 44 samples from control patients were included. The fluorescence intensity of adnexal structures did not differ significantly from that of the epidermis in pemphigus, except for hair follicles and sweat glands with C3 staining, where the epidermis showed stronger fluorescence. The sensitivity for the characteristic fluorescence pattern of at least 1 adnexal structure was 88.64% (n = 39/44, 95% CI 75.44% to 96.21%), with 100% specificity. The positive predictive value of adnexal fluorescence was 100%, and the negative predictive value was 89.8%. It was found that the honeycomb-like staining pattern of sweat glands, sweat gland ducts, and hair follicles is a highly specific marker for pemphigus vulgaris.

The article discusses the case of a 54-year-old African woman with central centrifugal cicatricial alopecia (CCCA) who experienced significant hair regrowth after using topical metformin 10% cream in combination with minoxidil 5% lotion. CCCA is a primary scarring alopecia that predominantly affects African women and is characterized by fibrosis rather than inflammation. Metformin, originally an antidiabetic drug, has shown promise as an antifibrotic treatment for CCCA by affecting key signaling pathways. While the results are encouraging, further controlled studies with a larger number of patients are necessary to confirm the effectiveness of this treatment approach. [Extracted from the article]

The study explores the daily fluctuation of inflammatory acne lesions over four days, providing visual evidence of changes in lesion size and number. The research suggests that individual acne lesions may cycle over time, impacting the overall inflammatory surface area. The findings highlight the importance of evaluating individual acne lesions in clinical studies to better understand the dynamics of acne development and treatment. [Extracted from the article]

The article discusses the use of interleukin-17 (IL-17) inhibitors in managing severe cases of rosacea, a chronic inflammatory skin condition. Two cases are presented where patients with severe rosacea showed improvement with IL-17 inhibitors, specifically brodalumab and secukinumab. The study suggests that IL-17 inhibitors could be effective in treating rosacea that is resistant to standard treatments, highlighting the need for further research through larger randomized controlled trials. [Extracted from the article]

This article reports on two cases of contact urticaria (CU) caused by the application of cosmetics containing the preservative phenoxyethanol. The reactions occurred on the face and not on other skin sites. Patch tests were performed, but the results were negative. Open tests on the forehead with the patients' own products and phenoxyethanol resulted in positive reactions. Phenoxyethanol is a rare allergen and can cause CU. The varying cutaneous reactivity of different body areas to the same substance, such as phenoxyethanol, may explain potential intolerance to cosmetics. [Extracted from the article]

Spontaneously arisen hereditary diseases in domestic animals provide an excellent opportunity to study the physiological functions of the altered genes. We investigated two 4-month-old sibling domestic short haired kittens with dry dark debris around the eyes, nose, and ears, dark crusting on the legs and a thin poor hair coat. Skin biopsies revealed abnormal sebaceous gland morphology with lack of normal sebocyte arrangement and differentiation. Hair follicles had a distorted silhouette, interpreted as a change secondary to the observed sebaceous gland dysplasia. Whole genome sequencing on both affected kittens and 65 genetically diverse feline genomes was performed. Filtering for variants that were present in both kittens but absent from the control genomes revealed a homozygous missense variant in SOAT1, encoding sterol O-acyltransferase 1. The protein is localized in the endoplasmic reticulum and catalyzes the formation of cholesteryl esters, an essential component of sebum and meibum. The identified SOAT1:c.1531G > A variant is predicted to change a highly conserved glycine residue within the last transmembrane domain of SOAT1, p.Gly511Arg. In mice, variants in Soat1 or complete knockout of the gene lead to the "hair interior defect" (hid) or abnormal Meibomian glands, respectively. SOAT1:c.1531G > A represents a plausible candidate variant for the observed sebaceous gland dysplasia in both kittens of this study. The variant was not present in 10 additional cats with a similar clinical and histopathological phenotype suggesting genetic heterogeneity. SOAT1 variants should be considered as potential cause in hereditary sebaceous gland dysplasias of humans and domestic animals.