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There are actually many different types of acne. One person can have different kinds at the same time and throughout the course of their life. Non-inflammatory acne is the mildest form and includes blackheads and whiteheads.
Blackheads, also called open comedones, form when the pore around the follicle remains open. The pimple appears black because it is exposed to the air and elements.
Whiteheads, or closed comedones, form when the blockage occurs beneath the surface of the skin and the pore closes around it, forming a white or yellow bump.
Inflammatory acne refers to pimples that are red and swollen, a sign of an underlying infection. For this reason, inflammatory acne tends to be more painful and requires more comprehensive treatment. Inflammatory acne includes pustular, papular, nodular, and cystic forms of acne.
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