Heat rash after exercise: how to prevent irritation

During exercise, rising skin temperature and sweating create a moist environment. Tight sportswear, straps, and repeated rubbing can keep heat against the skin, especially in folds or beneath clothing. Heat rash may cause prickly itching, small bumps, or redness. These symptoms can overlap with a broader [skin rash](/symptoms/skin-rash/), so the timing and pattern matter.

Choose breathable, loose-fitting exercise clothing and change out of damp kit soon after training. Take breaks in shade or a cool room, drink fluids according to your clinician’s advice, and cool the skin with a gentle lukewarm rinse. Pat dry rather than scrubbing. Avoid thick occlusive products before exercise; a bland [emollient therapy](/treatments/medical-dermatology/emollient-therapy/) product may be useful after the skin is cool if dryness is present.

Stop exercising and seek urgent help for confusion, faintness, severe weakness, trouble breathing, or a very high body temperature. Contact a clinician if bumps become painful, pus-filled, crusted, or increasingly red, or if the eruption continues despite cooling. Painful or changing [skin bumps](/symptoms/skin-bumps/) should not be assumed to be heat rash.

Ask whether your clothing, equipment, or skincare routine may be trapping sweat, and how soon you can resume your usual activity. If itching persists, ask whether a short course of [topical corticosteroids](/treatments/medical-dermatology/topical-corticosteroids/) is suitable for that location.