[Perforating granulomatous folliculitis in Becker's nevus (author's transl)].

Acneform lesions strictly confined to a Becker's nevus were observed in a 18-year-old man. Histologically, a granulomatous folliculitis with partial destruction of the epithelial root sheath and follicular cysts with focal penetration of keratin into the surrounding dermis were present, ruling out acne vulgaris. The concept of Becker's nevus as a complex nevogenic process, affecting ectodermal, neuroectodermal, and mesenchymal structures, also in terms of dysfunction of the pilary complex, is suggested.