An acne naevus.
Hughes
B R
BR
Cunliffe
W J
WJ
D000152:Acne Vulgaris / Q000150:complications* / Q000188:drug therapy; D000293:Adolescent; D004917:Erythromycin / Q000627:therapeutic use; D006801:Humans; D008297:Male; D009506:Nevus / Q000150:complications* / Q000188:drug therapy; D012867:Skin / Q000473:pathology
D004917:Erythromycin