A blackhead (medically known as an open comedoMedicine.net - Medical dictionary - definition of blackhead/open comedo , plural comedones Merriam–Webster Online) 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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A blackhead (medically known as an open comedoMedicine.net - Medical dictionary - definition of blackhead/open comedo , plural comedones Merriam–Webster Online) 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.
See also
- Acne vulgaris
- Pimple
- Keratosis pilaris
- Propionibacterium acnes

























