Pimple: An inflamed area of the skin with pus formation that results from an oil gland being infected with bacteria. Pimples are due to overactivity of the oil glands located at the base of the hair follicles, especially on the face, back, chest, and shoulders.
Quick GuideAdult Acne (Pimples) Causes and Treatments
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Last Editorial Review: 5/13/2016