Comedone: A pimple is full of oil. Unless really infected it is not pus that is there. It is oil. When you push it out, you leave a sore. Two things can happen, like any wound eschar forms. On the other hand, not all of the component comes out and the surface of the remaining content which is oil is oxidized and forms the black substance or the blackhead.
Answered 11/22/2013
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A doctor has provided 1 answer
A doctor has provided 1 answer
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