What should you know about heat rash sores?

Heat rash, also called prickly heat or sweat rash, develops when sweat cannot reach the skin surface easily. The area may feel prickly, itchy, raw or sore. Small clear blisters can occur, while deeper irritation may produce red bumps. Friction from tight clothing, skin folds, helmets or dressings can add to the discomfort. Heat rash is different from an infected wound, but broken skin can become infected if it is scratched.

The appearance can overlap with other causes of skin bumps, rash or redness. Note where the sores began, whether they followed sweating, and whether there is drainage, crusting or increasing tenderness.

Move to a cooler space and let the skin dry. Wear loose, breathable clothing and avoid heavy creams, oily ointments, fragranced products and vigorous rubbing over the affected area. A cool damp cloth may ease the sting; pat rather than scrub afterward. Keep folds gently clean and dry, and try not to scratch. A clinician or pharmacist can advise whether an emollient or a short course of a topical corticosteroid fits the location and appearance.

Arrange medical advice if sores spread despite cooling, keep returning, or do not begin improving after the heat and sweating stop. Seek prompt care for pus, yellow crusting, worsening warmth, marked swelling, fever, severe pain, or red streaking. Get urgent help for trouble breathing, facial swelling, faintness or widespread blistering.

Ask whether the appearance fits heat rash, whether any broken areas need infection care, and which product is suitable for the body site. Mention new medicines, recent exercise, occlusive clothing and any fever.