Development of proliferating trichilemmal cyst in organoid nevus. Presentation of two cases.

One of the two types of complications that may occur with organoid nevus (nevus sebaceus) is the category of brain malformations and seizure disorders. The second type is the late occurrence of various epithelial growths that are usually observed to develop in long-standing organoid nevi. Among these later-occurring lesions, we are describing the occurrence of proliferating trichilemmal cysts in association with organoid nevi.