Pus-filled bumps on skin: what to know

Pus is a mixture of inflammatory fluid, cells, and debris. A bump around a hair may fit folliculitis, while heat and sweating can aggravate heat rash. Keratosis pilaris usually feels rough and follicular, and milia are commonly firm, pale cysts rather than true pus-filled lesions. Lichen planus has a different inflammatory pattern. Location, colour, tenderness, itch, scale, and duration are more useful than the word pus alone.

Clean the area gently with lukewarm water, pat it dry, and avoid squeezing, scraping, or puncturing the bumps. Reduce friction and heat, wear breathable clothing, and stop any new product that stings. Do not use another person’s medicine. A clinician may suggest treatment for the identified cause; an antihistamine treatment can sometimes be discussed when itch is prominent, while cryotherapy is reserved for selected lesions after diagnosis.

Arrange an assessment when bumps persist, multiply, recur, become increasingly painful, or leave open sores or scars. Get urgent help for fever, rapidly spreading redness, severe swelling, marked weakness, or involvement around the eye. Bring a list of products and medicines, and note whether heat, shaving, sweating, or a new exposure preceded the change. Skin bumps that do not behave like a short-lived irritation deserve a closer look.

Ask what features support the diagnosis, whether a swab or skin examination is needed, which products to stop, and how to prevent recurrence. Mention the first day you noticed the bumps, their body sites, whether they itch or hurt, and any fever or drainage.