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When a comedo stays under the skin surface, it may be termed as a closed down comedo. They look just like whitened holes and bumps about the skin tone, and they are normally labeled whiteheads.

Start comedo:

In the event as opposed to a new finished comedo, the actual comedo pushes on the uppr surface of the skin color, it is deemed an amenable comedo. That  a new black bump around the skin color because the deposits involving melanin pigment in the area, and they are typically referred to as whiteheads.