...Open comedo (blackhead) - If the plug enlarges and pushes through the surface of the skin, it is called an open comedo, or blackhead. The plug's dark appearance is not due to dirt, but rather to a buildup of melanin, the skin's dark pigment....»
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«...Androgens do two things: First, they enlarge the sebaceous glands in the skin. Second, they cause these glands to increase sebum (oil) production. Androgens cause the sebaceous glands to enlarge (hormonal acne may result). This process is part of normal development....»
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