1. blackheadMedicine
Wikipedia definition
2. BlackheadA blackhead (medically known as an open comedo, plural comedones) is a yellow or blackish bump or plug on the skin. Blackheads are one of the common findings in acne vulgaris. Contrary to the common belief that it is caused by poor hygiene, blackheads are 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 as it oxidizes.
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