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Congenital Triangular Alopecia: A Close Mimicker of Alopecia Areata

Authors
Journal
International Journal of Trichology
0974-7753
Publisher
Medknow Publications
Publication Date
Volume
3
Issue
1
Identifiers
DOI: 10.4103/0974-7753.82135
Keywords
  • Letters To Editor
Disciplines
  • Medicine

Abstract

Sir, A 13-year-old male child presented with a localized area of hair loss over the left fronto-temporal region since the age of 3 years. The patch had remained persistent since its appearance. There was no history of any trauma or absence of skin at the site of alopecia at birth. None of the family members had similar hair loss. The patient had been treated in the past with topical and intra-lesional steroid by various dermatologists as a case of alopecia areata without any improvement. Examination revealed a 2.0×2.5 cm patch of non-scarring alopecia over the left fronto-temporal region with its apex toward the vertex [Figure 1]. A few vellus hair were present in the patch. There was no scaling or erythema in the lesion. Relative fixity of the patch, triangular shape of alopecia, absence of exclamation hair and lack of response to any treatment in past led us to the diagnosis of congenital triangular alopecia. Parents did not give consent for biopsy confirmation. Counseling of the parents was done about the poor prospect of hair regrowth and option of hair transplantation in future. Figure 1 Triangular patch of alopecia over the left fronto-temporal region Congenital triangular alopecia (CTA), also known as temporal triangular alopecia (TTA) or Brauer nevus, is a circumscribed, non-scarring form of alopecia present over the temporal region.[1] CTA was first reported by Sabouraud in 1905.[2] Around 52 cases have been reported so far.[3] It is characterized by triangular or lancet-shaped area of hair loss, usually unilaterally.[34] CTA, as its name suggests, is most of the time not congenital, but usually manifests after 2 years of age.[5] It is likely to be noticed by parents only in childhood when the vellus are replaced by terminal hair. It may rarely appear in adulthood as well.[6] Androgenetic alopecia might overlap with this condition and pose diagnostic confusion as the child grows up. The cause of CTA remains unknown. It usually occurs sporadically,

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