Heat rash with pimples: what to know

Heat rash, also called prickly heat, can form when sweat cannot move freely to the skin surface. The bumps may be flesh-coloured, pink, or red, and some can resemble tiny pimples. They commonly appear where sweat, tight clothing, skin folds, or rubbing trap warmth. Pus, crusting, marked tenderness, or a spreading area can point to another problem such as follicle inflammation or infection. A look at the bumps and their distribution helps a clinician separate these possibilities. Read more about [Heat Rash](/conditions/heat-rash/) and related [Skin Bumps](/symptoms/skin-bumps/).

Move to a cooler space, rinse with lukewarm or cool water, and pat dry rather than rubbing. Wear loose, breathable clothing and change damp garments promptly. Avoid heavy oils, thick occlusive creams, fragranced products, and scratching over the bumps. A light, bland moisturiser may help if the surrounding skin feels dry; see [Emollient Therapy](/treatments/medical-dermatology/emollient-therapy/) for context. Do not squeeze the pimples. If itching or inflammation persists, a clinician may discuss whether [Topical Corticosteroids](/treatments/medical-dermatology/topical-corticosteroids/) are appropriate for the site.

Arrange a dermatology assessment if the rash is painful, hot, rapidly spreading, draining, crusted, or not settling after cooling and gentle care. Seek urgent help for fever, feeling very unwell, facial swelling, breathing difficulty, or a severe blistering reaction. A rash in a sensitive area, or one that repeatedly returns, deserves an examination because the trigger may not be heat rash. You can compare your symptoms with [Skin Rash](/symptoms/skin-rash/) and [Skin Redness](/symptoms/skin-redness/), but those pages cannot diagnose the cause.

Ask whether the bumps fit heat rash or folliculitis, whether any product or clothing is contributing, which treatments are safe for the affected body site, and what changes should prompt a review.