A syndrome characterized by lesions occurring on the face, scalp, or neck which consist of congenital hypoplastic malformations of cutaneous structures and which over time undergo verrucous hyperplasia. Additionally it is associated with neurological symptoms and skeletal, ophthalmological, urogenital, and cardiovascular abnormalities. The disease is sebaceous of Jadassohn nevus (Experimental Factor Ontology identifier EFO_1001841). Also known as: Intraepidermal epithelioma of Jadassohn, Nevus, Sebaceous of Jadassohn.