Skin Glossary · Appearance of the skin

Pustule

Name: Meaning of Pustule
Published: 2026-08-25

Related terms · pus blister · yellow pimple

A pustule is a small lesion filled with yellow or white contents. They are common in folliculitis, but not all pustules have the same cause.

Reviewed by Korean Medicine Doctor Choi Yeon-seung · Last updated 2026-08-25

What does 'pustule' mean?

A pustule is a small lesion filled with contents that look like pus, typically appearing yellow or white. While common in folliculitis, not all pustules have the same cause.

How is it different from similar conditions?

They are distinguished from blisters filled with clear fluid, and the progression of acne-related pustules may differ from that of infectious folliculitis.

Why is this important in skin care?

Medical evaluation checks whether it is centered on the hair follicle, if there is pain and heat, and if it appeared after shaving or friction.

What should be checked based on my symptoms?

Repeatedly squeezing or popping them carries a risk of spreading and scarring; please seek medical evaluation if they spread widely or become painful.

Related conditions and medical guidance

Check guides where this term is used

Condition GuidanceFolliculitisFolliculitis typically appears as small red pimples or pus-filled pustules that suddenly form in clusters around the hair follicles. The area around the skin change may be red, itchy, or burning, and may be painful when pressed; scabs may form after pustules burst. Shallow folliculitis remains as small papules or pustules, but if it deepens, it may look like a large, hard, painful boil or a carbuncle where several boils are connected, increasing the risk of scarring and hair loss. If redness and pain spread suddenly or are accompanied by fever, chills, or body aches, the spreading infection must be promptly evaluated.Condition GuidanceRosaceaRosacea may begin with recurring redness on the face, centered around the nose, cheeks, forehead, and chin, or with the skin becoming darker than the usual skin tone, such as purple or brown, with the color persisting over time. It may be accompanied by burning, stinging, sensitivity, visible fine blood vessels, and papules, pustules, or edema that look like acne. In some cases, the skin on the nose, forehead, and chin thickens. Dryness, a foreign body sensation, redness, or eyelid swelling in the eyes may appear before skin symptoms; severe eye pain, light sensitivity, or changes in vision require a prompt ophthalmological evaluation.Medical Evaluation GuideWhen oozing, pus, pain, and fever occur togetherIf there is rapidly spreading redness, pain that makes it difficult to touch, pus or yellow crusts, fever, or severe swelling around the eyes and mouth, we will first connect you to infection treatment or emergency evaluation. If you have difficulty breathing or if your lips or tongue swell, seek emergency help immediately. Once urgent issues are resolved, remaining itchiness and recurring symptoms will be managed through Korean medicine treatment.

Evidence and Update Information

The definitions and safety standards in the materials below were referenced.

NCBI Clinical Methods: Principles of Skin Lesion ObservationClinical terms describing the shape, arrangement, and distribution of lesions have been verified.

What does 'pustule' mean?

How is it different from similar conditions?

Why is this important in skin care?

What should be checked based on my symptoms?

Check guides where this term is used

Terms to know for easier distinction