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pustule
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pustule

dermatology
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skin disease
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pustule, a small circumscribed elevation of the skin that is filled with pus, a fluid mixture containing necrotic (decomposing) inflammatory cells. Pustules are often infected and have a reddened, inflamed base. The most familiar pustules are the pimples of persons with acne. Skin pustules also appear in conditions such as chickenpox and smallpox.

This article was most recently revised and updated by Kara Rogers.