People with acne often have a range of lesions. The simplest acne lesion, known as comedo, or comedone, is basically an extended hair follicle sealed with bacteria and oil. This kind of lesion is frequently called a microcomedo since the naked eye may not see it. It's called a closed whitehead or comedo when the plugged follicle remains under the skin. Whiteheads often show on the surface of skin as little, whitish bumps. A comedo that comes up to the skin surface and breaks open is referred to as a blackhead since it appears black. The black color is not because of dirt. Whiteheads and blackheads can remain for a long time in the skin.
There are other bothersome acne lesions which can grow, such as the ones below:
Nodules: is a big, painful, and solid lesions which are buried deeply inside the skin.
Papules: are inflamed lesions which show up as little, pink bumps on the skin; they may be sensitive to the touch.
Pustules: are pus-laden, inflamed lesions which may be red at the root.
Cysts: are inflamed, deep, pus-laden lesions which may provoke pain and scarring.
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