Comedo naevus on the abdomen
Keywords: Comedo naevus, Comedone naevus, Comodonal naevus, Epidermal cyst, Epidermoid inclusion cyst, Hair follicle naevus, Nevus comedonicus
An epidermal naevus is due to an overgrowth of the epidermis. Lesions are present at birth (50%) or develop during childhood (mostly in the first year of life). The abnormality arises from a defect in the ectoderm, the outer layer of the embryo that gives rise to epidermis and neural tissue.
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