A normal follicle looks like this:
For reasons no one completely understands, follicles, often called pores, sometimes get blocked. Sebum (oil) which normally drains to the surface gets blocked and bacteria begins to grow. Both whiteheads and blackheads start out as a microcomedone. The picture below is a microcomedone:
January 18, 2009 at 9:27 PM
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January 19, 2009 at 10:12 PM
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June 13, 2012 at 9:09 AM
Sebum regulates the growth of bacteria that helps for acne treatment.