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Nevus sebaceus (NS) is a common hamartomatous birthmark found in up to 1% of dermatology patients. NS is usually noted on the head and neck region at birth and is usually stable until puberty, when it typically becomes more yellowish and cerebriform. Secondary tumors can develop within NS. The risk for malignancy is controversial, as is the timing of excision, with some advocating early excision while others recommend delayed excision or none at all. These authors analyzed 707 histopathologic specimens of NS treated over a 13.6-year period. Most nevi were located on the scalp (63%), face (25%), and trunk (5%).The average age of patients was 27.4 years (range, newborn to 95 years).
Trichoblastoma was the most common benign tumor (7%), followe…