Triangular Temporal Alopecia: A Rare Case in Adulthood

Temporal triangular alopecia (TTA) is a rare, non-scarring form of alopecia that typically presents in childhood but can also occur in adulthood. It is characterized by a triangular or lancet-shaped patch of hair loss on the temporal scalp, with normal surrounding skin and no inflammation. The etiology of TTA is unknown, though genetic factors are suspected. Histopathology shows normal hair follicle numbers with increased miniaturized and vellus hairs. TTA is often misdiagnosed as alopecia areata or androgenetic alopecia, but dermoscopy can aid in differentiation. Treatment options include hair excision, transplantation, and topical minoxidil, which has shown promise in preventing hair follicle miniaturization and improving hair growth. Accurate diagnosis is crucial to avoid inappropriate treatments.