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what is a blackhead?
A blackhead (medically known as an open comedo[1] , plural comedones [2]) is a yellowish or blackish bump or plug on the skin. A blackhead is a type of acne vulgaris. It is caused by excess oils that have accumulated in the sebaceous gland's duct. The substance found in these bumps mostly consists of keratin and modified sebum (an oily secretion of the sebaceous gland), which darkens (resembling dirt) as it oxidizes.
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Blackhead: A familiar term for what is medically called an open comedo.
A comedo, the primary sign of acne, consists of a dilated (widened) hair follicle filled with keratin squamae (skin debris), bacteria, and sebum (oil).
An open comedo has a wide opening to the skin and is capped with a blackened mass of skin debris.
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пробка, образованная из секрета сальных желез и кератина в наружных отверстиях выводных протоков сальных желез, открывающихся в коже.
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