A Case of Basal Cell Carcinoma Arising in Congenital Triangular Alopecia

August 2025 in “ Cureus ”

Allison Bai, Saman Namazian, Erika Elliott

congenital triangular alopecia basal cell carcinoma alopecic patch UV exposure genetic predispositions

This document discusses a unique case of a 48-year-old woman with congenital triangular alopecia (CTA) who developed basal cell carcinoma (BCC) within the alopecic patch, marking the first known instance of such a transformation. The case underscores the need for careful evaluation of long-standing alopecic areas for malignancy. While the exact mechanisms connecting CTA to cancer development are unclear, potential contributing factors include changes in the local immune environment, increased UV exposure, and genetic predispositions.

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A Case of Basal Cell Carcinoma Arising in Congenital Triangular Alopecia

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