Pigmentation in comedones.
D000152:Acne Vulgaris / Q000378:metabolism* / Q000473:pathology; D001706:Biopsy; D005145:Face; D006801:Humans; D008297:Male; D008543:Melanins / Q000378:metabolism; D008544:Melanocytes / Q000166:cytology; D010858:Pigmentation; D012867:Skin / Q000378:metabolism / Q000473:pathology
D008543:Melanins