Successful Treatment of Temporal Triangular Alopecia with Topical Minoxidil

This letter to the editor reports on a successful treatment of temporal triangular alopecia (TTA) with 3% topical minoxidil. TTA is a non-scarring alopecia that presents as an oval-shaped alopecic patch, confined to the frontotemporal scalp. The patient was a 1-year-old girl who had a bald patch on her scalp since birth. After two months of 3% topical minoxidil treatment, hair began to grow on the alopecic patch. However, when the patient's mother stopped applying the medication due to irritation, hair loss resumed at the same site. After restarting the treatment, the hair on the site was re-grown after 1 month. After nine months of treatment, the alopecic patch was packed with hair, which had a similar thickness to the intact hair around the lesion. The study suggests that TTA may be related to the dysregulation of hair cycle and further, topical minoxidil treatment might be applicable for the treatment of other TTA cases.