Heat rash on arms and legs

On the arms, it may occur beneath sleeves, around the elbows, or where sports equipment presses against the skin. On the legs, sweaty trousers, socks, boots, or areas that rub during walking can contribute. The affected skin may feel prickly or sting after activity and may improve when it is cooled and uncovered.

Clusters of bumps can resemble [Skin Bumps](/symptoms/skin-bumps/) or a broader [Skin Rash](/symptoms/skin-rash/). A rash limited to one contact area may have a different explanation, so the pattern, timing, and exposures matter.

Remove damp or tight clothing, rinse gently if sweat has collected, and pat the skin dry. Wear loose, breathable layers and change socks after sweating. A cool compress can calm the prickling; avoid ice directly on the skin. Keep nails short if itching is strong so scratching is less likely to damage the surface.

Do not cover fresh bumps with thick greasy products or fragranced lotions. Once irritation has eased, a clinician can advise whether [Emollient Therapy](/treatments/medical-dermatology/emollient-therapy/) fits your skin. Prescription treatment should be selected for the exact rash and location.

Have it assessed if it persists despite cooling, spreads beyond the sweaty or covered areas, returns often, or develops pain, warmth, pus, crusting, or fever. Seek urgent care for rapid swelling, breathing difficulty, faintness, or severe skin pain. New [Skin Redness](/symptoms/skin-redness/) after a medicine or exposure also deserves prompt advice.

Could clothing, equipment, a product, or infection be contributing? What can I safely use on my arms or legs if the itch remains?