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Definition of Pustule

Pustule: A pustule is a small collection of pus in the top layer of skin (epidermis) or beneath it in the dermis. Pustules frequently form in sweat glands or hair follicles. Pus is a mixture of inflammatory cells and liquid.

Put somewhat more simply, a pustule is a little pocket full of pus.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=9538
Last Editorial Review: 9/20/2012

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