A broad term for a pore, or hair follicle, that's blocked by sticky dead skin cells and the sebum that can't drain properly. When the follicle remains open, the sebum's pigment darkens from air exposure, forming a blackhead. When P. Acnes bacteria invade the clogged pore, the resulting inflammation creates a whitehead.
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A plug of sebaceous and dead skin material stuck in the opening of a hair follicle. The follicle may be open (blackhead) or almost closed (whitehead).Pronunciation: CO-mee-doen (noun)Also Known As: acne, blackhead, open comedone, whitehead, closed comedone
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