How to prevent heat rash

Heat rash forms when sweat cannot move freely to the skin surface. Hot weather, exercise, tight clothing, skin folds, and prolonged dampness can all create a warm, humid pocket. The result may be prickling, itching, tiny bumps, or a change in skin colour. Repeated episodes suggest that heat and moisture are recurring triggers, but a similar-looking rash may have another cause.

Choose light, loose clothing and breathable fabrics, particularly during outdoor activity. Take breaks in shade or air conditioning, rinse sweat from the skin when practical, and pat folds dry. Avoid thick occlusive products on areas that sweat heavily unless prescribed. Keep bedding and work clothing comfortable, and change after swimming or exercise. If friction or dry irritation is also present, ask about an appropriate emollient rather than applying a heavy layer without guidance.

Consult a clinician if episodes keep returning despite reducing heat and moisture, or if the rash becomes tender, wet, crusted, or pus-filled. Fever, rapidly increasing redness, significant swelling, or feeling unwell needs prompt assessment. Persistent symptoms may call for a different diagnosis or treatment plan.

Ask which triggers matter most for your skin, whether a product is clogging or irritating the area, and what to use if prevention fails.