Blackheads are also called open comedowns. Comedowns are the skin-colored bumps that form when you have a pimple. In the case of blackheads, these comedones consist of follicles beneath your skin with very large openings, or pores.
When you have blackheads, these large pores become clogged with a substance known as sebum. A chemical reaction with the sebum occurs under your skin. Melanin is oxidized and turns the clogged pores a black color. This form of acne is often found on your back, shoulders, and face.
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