What should you know about bumpy heat rash?

The bumps may be red, skin-coloured, or filled with clear fluid. They commonly appear in skin folds or beneath tight clothing where heat, sweat, and friction collect. Stinging or itching can be more noticeable after exercise, outdoor heat, or a warm room. Heat rash usually affects the surface of the skin; a deep, painful lump, spreading redness, or a rash with fever suggests another problem and should not be assumed to be heat rash.

Move to a cooler place, loosen clothing, and rinse or gently wash away sweat. Pat dry rather than rubbing. Wear breathable fabrics and take breaks from heat or strenuous activity while the rash settles. Avoid oily products, heavy occlusive creams, and scratching, which can worsen blocked ducts or break the skin. A bland emollient may help dryness, while a clinician may recommend a topical corticosteroid for selected inflammation and for a limited period.

Contact a clinician if the rash is not improving after cooling and gentle care, keeps returning, becomes painful, or develops crusting or pus. Seek urgent help for fever, marked swelling, severe pain, dizziness, confusion, or breathing difficulty. These symptoms can indicate infection, heat illness, or a serious allergic reaction rather than uncomplicated heat rash.

Does this pattern fit heat rash or another skin rash? Could a product, medicine, or infection be contributing? Which moisturiser is suitable for my skin? How should I use a topical corticosteroid if one is advised?