Nevus Epidermal nevus 2010-07-10T12:12:32Z Epidermal naevi are due to an overgrowth of the epidermis and may be present at birth (50%) or develop during childhood. SNOMEDCT_US:239107007 UMLS:C0334082 Epidermal nevi Epidermal nevus arises from a defect in the ectoderm and in general are due to an overgrowth of keratinocytes. Subclasses of epidermal nevus include Linear epidermal naevus, epidermolytic epidermal naevus, acantholytic epidermal naevus, linear porokeratosis, and systematized epidermal naevus. Several other conditions are also characterized by benign overgrowth of the epidermis and its appendages (organoid naevi), including inflammatory linear verrucous epidermal naevus, sebaceous naevus, sweat gland naevi, comedone naevus, and Becker naevus. SNOMEDCT_US:25201003 HP:0010816