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What are pustules?

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A pustule is a bulging patch of skin that's full of a yellowish fluid called pus. It's basically a big pimple. Several conditions, ranging from something as common as acne to the once-deadly disease smallpox, can cause pustules.

From: What Are Pustules? WebMD Medical Reference

SOURCES:

National Library of Medicine.

University of California San Francisco Medical School.

American Academy of Dermatology: "Different Kinds of Pimples."

National Institute of Arthritis and Musculoskeletal and Skin Diseases.

National Psoriasis Foundation: "Pustular Psoriasis."

American Family Physician: "Evaluating the Febrile Patient with a Rash."

Archives of Dermatology : "Subcorneal pustular dermatosis-type IgA pemphigus with autoantibodies to desmocollins 1, 2, and 3."

CDC.

World Health Organization: "Smallpox."

Reviewed by Stephanie S. Gardner on January 29, 2019

SOURCES:

National Library of Medicine.

University of California San Francisco Medical School.

American Academy of Dermatology: "Different Kinds of Pimples."

National Institute of Arthritis and Musculoskeletal and Skin Diseases.

National Psoriasis Foundation: "Pustular Psoriasis."

American Family Physician: "Evaluating the Febrile Patient with a Rash."

Archives of Dermatology : "Subcorneal pustular dermatosis-type IgA pemphigus with autoantibodies to desmocollins 1, 2, and 3."

CDC.

World Health Organization: "Smallpox."

Reviewed by Stephanie S. Gardner on January 29, 2019

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