A case of temporal triangular alopecia

Temporal triangular alopecia (TTA) is a non-cicatricial alopecia characterized by an alopecic patch, usually located in the frontotemporal region, unilateral or bilateral, with an oval or narrow triangular base and no terminal hairs on it. It can manifest at birth or develop in the first years of life. It is a rare condition and its exact etiology remains unknown. The diagnosis is based on its clinical appearance. The differential diagnosis includes alopecia areata, trichotillomania, tractional alopecia and congenital aplasia cutis. Due to its rarity, misdiagnosis and unnecessary treatments can be applied. Clinical and dermoscopic examination is sufficient in the diagnosis of the disease. A 3-year-old boy with a diagnosis of TTA is presented as a case report.