What is a comedo?

What is a comedo? Here are some definitions.

Noun
  1. (medicine) A blackhead or whitehead.
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Not only do retinoids inhibit comedo formation, they can usually clear all degrees of comedonal acne, but this may take a few months.
In our case, the senile degeneration of connective tissue is suspected to be the occasion of comedo formation.
A comedo occurs when an oil follicle becomes plugged with oil, dead skin, tiny hairs or bacteria.
An open comedo is known as a blackhead, and a closed comedo is commonly referred to as a whitehead.
A closed comedo, or white head, occurs when the blockage is complete.
If the plug enlarges and is on the surface of the skin, exposed to the air, it is called an open comedo, or blackhead.

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