Nevus Sebaceous

Nevus sebaceous is a congenital skin condition which typically appears on the scalp, but may also develop on the face or neck. Present at birth, the condition initially consists of a single hairless patch of orange-yellow skin. During adolescence, the lesion may become warty, bumpy or scaly. In rare cases, the condition may be associated with neurological conditions such as epilepsy. Additionally, tumors may form within lesions, and may be either benign or malignant.

Nevus sebaceous is caused by groups of defective cells in the ectoderm, the part of the embryo which forms the outer layer of skin and associated tissues, and is thought to be due to a genetic abnormality. The condition may occur as a syndrome, in which multiple lesions are present in conjunction with various brain, skeletal or eye conditions, though it is exceedingly rare. (adapted from Online derm clinic)

Article and image from Chris Schach (link)

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