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comedo (kom´ә-do) pl. comedo´nes  a plug of keratin and sebum within the dilated orifice of a hair follicle frequently containing the bacteria Corynebacterium acnes, Staphylococcus albus, and Pityrosporum ovale; see also acne vulgaris.
 

closed comedo  whitehead (def. 1).

open comedo  blackhead.





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