Epidermal naevus characterized by an asymptomatic irregular macular hyperpigmentation with hypertrichosis occurring mainly on the shoulders, anterior chest, or scapular region of adolescent males. It usually follows sun exposure. First a greyish-brown pigmentation appears. After a variable interval, usually a year or two, thick dark hairs appear in the region of the pigmented area. Once present, Becker's nevi remain indefinitely.
Becker's Nevus, Becker's Nevus, Melanosis Neviformis
Becker's naevus, Becker's nevus, Lin papul ecto-mesoderm hamart, Linear papular ectodermal-mesodermal hamartoma, Pigmented hairy epidermal nevus, Pigmented hairy naevus Becker, Pigmented hairy naevus of Becker, Pigmented hairy nevus Becker, Pigmented hairy nevus of Becker, Progr cribri+zosteri hyperpigt, Progressive cribriform and zosteriform hyperpigmentation