Heat rash on hands and arms: a practical guide

The rash can follow the forearms, wrists, backs of the hands, or areas covered by sleeves and gloves. Small bumps may feel rough, prickly, or sore after exercise, outdoor heat, or humid conditions. The pattern can be uneven where clothing presses or sweat collects. Scaling, deep cracks, pus, or a rash that follows a new detergent may suggest a different problem. Learn more about Heat Rash and related symptoms such as Skin Bumps, Skin Rash, and Skin Redness.

Get out of the heat, loosen sleeves, and let sweat evaporate. Rinse gently, pat dry, and use a cool cloth for short periods. Wear loose, breathable clothing and change out of damp garments. Avoid fragranced products, greasy layers, scratching, and prolonged occlusion. Once the skin is dry and calm, a suitable Emollient Therapy product may reduce friction and support the barrier. If inflammation persists, ask a clinician about whether Topical Corticosteroids fit the diagnosis and location.

Arrange medical advice if cooling does not help, the rash continues to spread, or episodes keep recurring without an obvious heat trigger. Seek prompt care for fever, pus, yellow crusting, severe tenderness, rapidly expanding redness, or swelling of the hand. Emergency help is appropriate for breathing difficulty, facial swelling, faintness, or extensive blistering.

Ask whether the distribution fits heat rash, eczema, or contact dermatitis; whether work clothing or equipment is contributing; and how to protect the hands while the rash heals. Tell the clinician about heat exposure, exercise, new detergents, gloves, and any medicines applied.