Perinevoid Alopecia and Concentric Regrowth: Two Atypical Patterns of Alopecia Areata

This letter to the editor discusses two atypical patterns of alopecia areata: perinevoid alopecia (PA) and concentric regrowth (CR). A case study of a 44-year-old male with a 3-month history of an alopecic patch around a pigmented nevus is presented. The patient exhibited two concentric alopecic patches, and after the nevus was excised, complete hair regrowth occurred within 2 months with no recurrences. Histopathological examination revealed increased catagen and telogen follicles, a lymphocytic infiltrate, and increased perifollicular mucin. PA and CR are rare, with CR being the most frequent form among paradoxical regrowth patterns. The coexistence of both patterns in this case is unique and highlights the importance of recognizing these patterns for proper diagnosis and treatment.