Becker's nevus with neurofibromatosis type 1.

Neurofibromatosis type 1 is an autosomal dominant disorder which primarily affects the growth and development of neural cell tissues. It presents as multiple tumor-like growths over the skin that arises from the nerves and is associated with other abnormalities like pigmentation over the skin and bone deformities. Becker's nevus or hairy pigmented epidermal nevus is a benign cutaneous hamartoma which is characterized by hyperpigmented macule with hypertrichosis. It is rarely associated with neurofibromatosis. We report a 22-years-old male with coexistent Becker's nevus and type 1 neurofibromatosis.