A blackhead (technically known as a open comedo) is a yellowish or blackish bump or plug on the skin.
An open comedo or blackhead is a type of acne vulgaris.
It is caused by excess oils that have accumulated in the sebaceous gland's duct.
For more information about the topic Blackhead, read the full article at Wikipedia.org, or see the following related articles:
Editor's Note: This article is not intended to provide medical advice, diagnosis or treatment.
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