P17 ALOPECIA AREATA IN A PATIENT WITH BASAL CELL CARCINOMA ARISING ON NEVUS SEBACEUS
Park ES, Choi JW, Youn SW, Park KC, Huh CH
Department of Dermatology, Seoul National University College of Medicine, Seoul, Korea

A 32-year-old Korean man presented with a well-demarcated verrucous plaque and a surrounding alopecic patch on parietal scalp. The yellowish plaque on scalp was noted at birth, thus it has been known as nevus sebaceous clinically. But, six years ago, firm brownish nodules started to appear on it and multiple alopecic patches was developed including the one around it. He has been treated with intralesional steroid injection at other hospital, under clinically diagnosis of alopecia areata. His hairs show re-growth, but there was no effect on the perinevoid alopecic patch. We perform a biopsy on brownish nodules and a histopathologic examination revealed a basal cell carcinoma arising from nevus sebaceus. After complete excision of nevus sebaceus with associated basal cell carcinoma, the perinevoid alopecic patch disappeared spontaneously. It is presumed that autoantibodies to basal cell carcinoma might be involved in inducing the alopecia areata in this patient.