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Abstract Background Frontal fibrosing alopecia (FFA) is a form of inflammatory and cicatricial alopecia, presenting concomitantly with rarefaction of eyebrows and body hair. However, the involvement of body hair in FFA is still poorly investigated. Objectives To compare the dermoscopy findings of axillary hairs in a group of women with FFA with a group of women without FFA. Methods An observational case‐control study was carried out on the dermoscopic findings of the axillary hair in this group of patients with FFA compared to a group of women without FFA, matched by age groups and skin phototypes. Results Thirty women with a clinical and histopathological diagnosis of FFA were included in the study. Dermoscopy of the axilla in patients with FFA revealed the presence of axillary hair in 93.3% and all patients had hairless follicular openings. More than one wire per follicular ostium was observed in 70% of the patients and variability in the diameter of the hairs in 83.3% of the cases. Regarding dermoscopic inflammatory signs, a peripillary brownish halo was present in 83.3% of patients, peripillary scaling in 56.7%, diffuse scaling in 63.3% and pigmented network of the epidermis in 73.3% of the cases. When comparing the dermoscopic findings of the axilla of cases with controls, the chance of occurrence of brownish peripillary halos between cases was higher than double the chance of occurrence of these halos among controls (OR = 2.7; 95% CI: 1.1−7.6; p = 0.029). The rest of variables were not statistically associated with the FFA. Conclusions Dermoscopy of the axilla in patients with FFA revealed that brownish peripillary halos may be a diagnostic clue for FFA in the axillary region. The dermoscopy findings found in the present study allow characterizing the axillary involvement of patients with FFA and recognize the dermoscopic differences with other dermatoses involving this location.

Cutaneous adverse drug reactions (ADR) are skin conditions due to a drug, regardless of the way of administration. Knowledge about their frequency, clinical manifestations and histopathological patterns is essential for prevention and early diagnosis, avoiding complications and reducing morbidity. This work assessed the incidence of cutaneous ADR in skin biopsies from patients with dermatitis, and determined their histopathological patterns. Skin biopsies from patients with dermatitis, obtained in the years 2006-2007 at the Pathology Division of the HU/UFJF, were analyzed. The different histopathological patterns were grouped, the cases were statistically analyzed and a clinicopathological matching was attempted. Of the 1409 skin biopsies, 304 cases of dermatitis were diagnosed, 31 corresponding to cutaneous ADR. The most frequent histopathological pattern was vacuolar interface dermatitis (41.9%). The most frequently involved drug was captopril. Identification of histopathological patterns and anatomoclinical correlation are indispensable for the differential between cutaneous ADR and the other dermatitidis, allowing for an early and precise diagnosis and reducing treatment and hospitalization costs.