Korean J Dermatol.  1999 Nov;37(11):1659-1663.

A Case of Trichoblastoma Arising from Nevus Sebaceus

  • 1Department of Dermatology, College of Medicine, Kyung Hee University, Seoul, Korea.


Nevus sebaceus is a hamartoma of the skin with the potential to develop benign and maligmant neoplasms. Trichoblastoma is a benign neoplasm that consists of follicular germinative cells. We report a case of trichoblastoma arising from nevus sebaceus in a 22-year old female, who showed a dome-shaped, solitary nodule within yellowish hairless plaque on the occipital area. Histopathologic findings revealed tumoral lobules of basaloid cells affecting the full thickeness of the dermis. Some lobules had at their centers cystic cavities filled with large amounts of melanin. Tumoral lobules of the deeper part of the neoplasm were surrounded by hyalinized collagen bundles with immature fibroblast. The overall architectures was reminiscent of hair bulbs.


Nevus sebaceus; Trichoblastoma
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