Clinical and trichoscopic characteristics of temporal triangular alopecia: A multicenter study.

Abstract

To the Editor:Congenital triangular alopecia, also called temporal triangular alopecia (TTA), is an asymptomatic permanent circumscribed noncicatricial alopecia.1,2 It manifests as an alopecic patch without any underlying cutaneous alterations usually confined to one frontotemporal region of the scalp. Fine vellus hairs may be present. TTA is usually noted in children between 3 and 6 years of age and has been associated with Down syndrome, leukonychia, sectorial hyperpigmentation of the iris, woolly hair, mental retardation, epilepsy, and other malformations, such as Dandy-Walker and LEOPARD syndromes