Triangular Temporal Alopecia: Two Case Reports, Dermoscopy, and Review

Triangular temporal alopecia (TTA), also known as congenital triangular alopecia or Brauer nevus, is a benign, non-scarring hair loss pattern typically located in the temporal region and often unilateral. It can appear in childhood or adulthood and may be triangular, oval, or lancet-shaped. Histopathology shows preserved follicles with mostly vellus hair, while dermoscopy reveals vellus hairs in the affected area surrounded by normal terminal hairs. With around 130 cases reported in the literature, dermoscopy has been highlighted as a crucial diagnostic tool. Treatment options are limited, but surgical excision and hair transplantation have provided better aesthetic outcomes.