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 pimple full of pus.
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A circumscribed, superficial elevation of the skin, up to 1.0 cm in diameter, containing purulent material. [L. pustula]
- malignant p. SYN: cutaneous anthrax.
- spongiform p. of Kogoj an epidermal p. formed by infiltration of neutrophils into necrotic epidermis in which the cell walls persist as a spongelike network; seen in pustular psoriasis.

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pus·tule 'pəs-(.)chü(ə)l, -(.)t(y)ü(ə)l n
1) a small circumscribed elevation of the skin containing pus and having an inflamed base
2) a small often distinctively colored elevation or spot resembling a blister or pimple

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a small pus-containing blister on the skin.

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pus·tule (pusґtūl) [L. pustula] a visible collection of pus within or beneath the epidermis. pustular adj


Medical dictionary. 2011.


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