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How pimples form

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Illustration of a pimple forming in a hair shaft

Pimples form when dead skin cells mix with excess oil (sebum). This mixture plugs the pore, causing swelling. Bacteria can grow in the mix and lead to infection and pus.

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Last Updated: March 1, 2007
Medical Review:
Kathleen Romito, MD - Family Medicine

Alexander H. Murray, MD, FRCPC - Dermatology


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