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Comedone

By Heather Brannon, MD, About.com

Updated: January 04, 2004

About.com Health's Disease and Condition content is reviewed by the Medical Review Board

Definition: 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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