Localized Acquired Alopecia over the Mental Area of Chin

Abstract

Congenital triangular alopecia (CTA), also known as Brauer nevus or temporal triangular alopecia, may be present at birth or acquired during the first decade of life. It is a benign and unusual non-scarring triangular, oval, or lancet-shaped patch of alopecia. CTA Usually involving the temporal scalp. There are few reports of occipital scalp involvement, bilateral disease and only one report for eyebrows affection. Here we present a unique case of triangular alopecia involving the chin in a 12-year-old male. Alopecia areata, trichotillomania, and aplasia cutis congenital may be considered good differential diagnoses. Trichoscopy showing significant decrease in hair diameter diversity with increased number of vellus and intermediate hair and histopathology showing normal hair follicle density and increased vellus and intermediate hair. There is no effective treatment for it and, in most cases; there is no need for therapeutic intervention. Therapeutic modalities include topical minoxidil, surgical excision, and hair transplantation.