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Reference Terms
from Wikipedia, the free encyclopedia


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.

Note:   The above text is excerpted from the Wikipedia article "Blackhead", which has been released under the GNU Free Documentation License.
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February 24, 2017

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updated 12:56 pm ET