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.
Medical Review:Kathleen Romito, MD - Family Medicine
Alexander H. Murray, MD, FRCPC - Dermatology
Alexander H. Murray, MD, FRCPC - Dermatology
Last Updated: 03/01/2007
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