Clinical and Trichoscopic Characteristics of Temporal Triangular Alopecia: A Multicenter Study

This multicenter observational study described the clinical and trichoscopic characteristics of temporal triangular alopecia (TTA) in 31 patients from six hospitals in Spain. TTA was found to affect both sexes, with a slight predominance in females, and was most often located on the left side of the scalp. The condition typically presented as a triangular-shaped alopecic patch averaging 3.6 cm in length and was usually diagnosed within the first 2 years of life. Trichoscopy revealed features such as white hairs, vellus hairs, and hairs of diverse diameters. The study found no consistently effective treatment for TTA, with most patients showing no improvement with expectant management or corticosteroid treatments. Only one patient showed improvement with a combination of topical minoxidil and corticosteroids.