Congenital Triangular Alopecia (Brauer Nevus)

Abstract

Congenital triangular alopecia is manifested at 3 to 5 years of age by unilateral or, less frequently, bilateral patches of alopecia in the frontotemporal region. At this age the differential diagnosis is important, particularly as regards alopecia areata. Only about 47 cases have been reported, probably because the lesion is benign and nonprogressive. In 6200 patients seen in index visits, we found 7 with triangular alopecia, a frequency of 0.11%. We believe that males do not require treatment because of the later development of androgenic alopecia, but in women, surgical treatment is successful.

Trichoscopy of Focal Alopecia in Children - New Trichoscopic Findings: Hair Bulbs Arranged Radially along Hair-Bearing Margins in Aplasia Cutis Congenita

“…Its incidence has been estimated at 0.11% [13]. The majority of cases present between 2 and 6 years of age with a unilateral alopecia patch in the frontotemporal region.…”

Congenital atrichia and hypotrichosis

“…Only about 47 cases have been reported, probably because the lesion is benign and nonprogressive. A frequency of 0.11% is reported by García-Hernández et al [35] Males affected by CTA do not require treatment because of the later development of androgenic alopecia, but women might benefi t from surgical treatment.…”

Incidence of congenital triangular alopecia

“…2 Taken at face value, readers may assume that 0.11% of the general population have congenital triangular alopecia. The 0.11% number was derived from the study by Garcia-Hernandez et al.…”

“…They reviewed 6,200 randomly selected patients seen for the first time at a dermatology clinic at the Virgen Macarena University Hospital in Spain, and found that 7 (0.11%) patients had congenital triangular alopecia. 2 We would like to point out that the population studied was highly selective and did not represent the true incidence among the general population.…”