What should you know about constant heat rash?

Heat rash, also called prickly heat, develops when sweat cannot move freely through the skin. It may appear as tiny bumps, redness, or an itchy or prickling rash in folds, under clothing, or where skin rubs together. Hot weather, exercise, humid rooms, occlusive fabrics, and prolonged sweating can keep triggering it. A rash that persists in a cool environment may instead be another type of skin rash, so its distribution and appearance matter.

Move to a cooler place, rinse away sweat with lukewarm water, and pat the skin dry. Wear loose, breathable clothing and change out of damp garments. Keep affected folds dry, avoid thick occlusive products, and use a cool compress for short periods. A bland emollient may help if the skin is dry or rubbed, while a clinician may consider a topical corticosteroid for selected inflamed areas. Do not apply medicated products to broken skin without advice.

Arrange a review when the rash keeps returning despite cooling measures, spreads, becomes painful, or develops crusting, pus, or marked swelling. Seek urgent help for breathing difficulty, faintness, confusion, or signs of severe overheating such as hot skin with altered alertness. Fever in an infant with a widespread rash also warrants prompt assessment.

Ask whether the pattern fits heat rash, what triggers should be avoided, and whether an emollient or topical corticosteroid is appropriate. Mention how quickly the rash appears after heat, whether it affects folds, and any new medicines or products.