Temporal triangular alopecia, also referred as congenital triangular alopecia, is
an uncommon dermatosis of unknown etiology. It is characterized by a
non-scarring, circumscribed alopecia often located unilaterally in the
frontotemporal region. It usually emerges at ages 2-9 years. Alopecia areata is
the main differential diagnosis, especially in atypical cases. Dermoscopy is a
noninvasive procedure that helps distinguish temporal triangular alopecia from
aloepecia areata. Such procedure prevents invasive diagnostic methods as well as
ineffective treatments.