Naevus comedonicus: a spectrum of body involvement.

Naevus comedonicus (NC) is a rare developmental anomaly, with < 200 cases reported in the literature. It usually occurs on the face, neck or chest, appearing as groups of closely arranged dilated follicular openings with keratin plugs. Several associations have been made in the literature. We review the current literature, emphasizing the clinical features, associated conditions and therapeutic options.