Not all black follicular plugs are comedones!
Grosshans
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EM
D000152:Acne Vulgaris / Q000473:pathology*; D000368:Aged; D003937:Diagnosis, Differential; D018859:Hair Follicle / Q000473:pathology*; D006801:Humans; D007633:Keratins / Q000032:analysis; D007642:Keratosis / Q000473:pathology*; D008297:Male; D012867:Skin / Q000737:chemistry; D012871:Skin Diseases / Q000473:pathology
D007633:Keratins