Acne is a common skin condition that happens when hair follicles under the skin become clogged. Sebumโ€”oil that helps keep skin from drying outโ€”and dead skin cells plug the pores, which. What is acne? It is caused when blocked skin follicles from a plug caused by oil from glands, bacteria, and dead cells clump together and swell. Jun 26, 2024ย ยท Learn about acne, including how it is diagnosed and treated, and the steps you can take to help prevent outbreaks.

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