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Introduction: To date, only a limited number of case reports have documented the co-occurrence of PNS and melanocytic nevus in the medical literature. This study aims to report an exceptionally rare case of posterior chest wall PNS in conjunction with a melanocytic nevus., Case Presentation: A 46-year-old female presented with a long-standing black lesion on her left upper posterior chest wall, that had become painful in the two months prior to presentation. There was a painful, dark blue, non-erythematous, and non-tender nodule on the left upper posterior chest wall. Based on the patient's desire for cosmetic purposes, the lesion was excised totally with primary closure under local anaesthesia. Histopathological examination revealed intradermal melanocytic nevus with inflamed pilonidal sinus., Discussion: The rarity of posterior chest wall PNS associated with nevi poses unique diagnostic and therapeutic challenges for clinicians. The distinct anatomical location, different from the conventional region, and the rare association between the two conditions may delay accurate diagnosis and result in mismanagement or inappropriate interventions., Conclusion: The posterior chest wall PNS is another type of atypical PNS that is extremely rare. The association between PNS and blue nevus is a fascinating medical finding that deserves further investigation., (© 2024. The Author(s).)

There are controversies regarding the management of umbilical pilonidal sinuses. The current study aims to report on the efficacy of a non-operative, umbilical conserving procedure in the treatment of umbilical pilonidal sinus. This is a prospective, single cohort study. The cases were managed in a single private practice center. Patients were assessed and managed throughout the previous nine years (from January 2013 to June 2022). The required information was obtained from the center's medical database. The current study included 114 patients. There were 82 (71.9%) male patients. The patients' ages varied from 14 to 56 years (mean = 23.24). The umbilicus was retracted under local anesthesia. The sinuses were cleaned with povidone-iodine. Following the drying of the cavity, the mixture was put in the umbilicus, and the area was dressed. The amount of mixture was determined by the size of the cavity. Following treatment, the patients were directly discharged home with instructions to remove all hair from the chest and abdomen and keep the dressing dry for three days. After three days, the patients were advised to use a clean cotton swab to remove the injected mixture. Recurrence was reported in 5 cases (4.4%). The current technique might be used effectively in the treatment of umbilical pilonidal sinus. It is an umbilical preserving technique with a minimal recurrence rate., (© 2023 The Authors. International Wound Journal published by Medicalhelplines.com Inc and John Wiley & Sons Ltd.)