title: The pigment of comedones.
mesh_terms: D000152:Acne Vulgaris / Q000378:metabolism*; D000328:Adult; D000417:Albinism; D044383:Black People; D002244:Carbon / Q000032:analysis; D002648:Child; D004578:Electron Spin Resonance Spectroscopy; D005260:Female; D006651:Histocytochemistry; D006801:Humans; D008297:Male; D008543:Melanins / Q000032:analysis*; D008670:Metals / Q000032:analysis; D008853:Microscopy; D008875:Middle Aged; D010858:Pigmentation; D010860:Pigments, Biological / Q000032:analysis*
chemical_list: D008543:Melanins; D008670:Metals; D010860:Pigments, Biological; D002244:Carbon