Five cases of congenital triangular alopecia

Congenital triangular alopecia has been reported as a rare form of focal hair loss, characterized by a triangular patch of permanent alopecia on the frontoparietal area of the scalp, present from birth. However, it shows diverse clinical spectra of onset, shape and location and, furthermore, it may not be as rare as previously thought. Therefore, in order to avoid inappropriate management, it is very important to differentiate it from preclinical nevoid entities such as epidermal nevus, aplasia cutis and, especially, alopecia areata. We herein report five cases of congenital triangular alopecia.