Pediatric heat rash: what parents should know

Heat rash, also called prickly heat, develops when sweat ducts become blocked and sweat irritates the skin. Children may have tiny red or clear bumps, itching, stinging, or clusters of [Skin Bumps](/symptoms/skin-bumps/) beneath clothing or in folds of the neck, chest, back, or nappy area. The rash can look like a broader [Skin Rash](/symptoms/skin-rash/) or cause [Skin Redness](/symptoms/skin-redness/). It is often linked with hot, humid conditions, overdressing, fever, or tight materials. A clinician should reassess a rash that does not fit this pattern.

Move the child to a cool space and remove extra layers. Dress them in loose, breathable clothing and change damp garments promptly. A lukewarm bath or cool, clean cloth can ease irritation; pat the skin dry rather than rubbing it. Keep folds clean and dry, and avoid thick ointments, fragranced products, and powders that may trap heat or irritate breathing. An emollient may help if the surrounding skin is dry, but choose a light product and stop if the rash worsens. A pharmacist or clinician can advise whether a short course of prescribed topical corticosteroids is appropriate; do not apply steroid cream near the eyes or over broken skin without guidance.

Contact a clinician if the rash is spreading, lasts after cooling, becomes painful, leaks fluid, develops crusts, or is accompanied by a fever. Seek urgent help if the child is unusually sleepy, difficult to wake, breathing poorly, not drinking, or showing signs of overheating such as confusion or faintness. A baby with a rapidly worsening rash also needs prompt assessment because infection and other illnesses can resemble heat rash.

Ask whether the pattern is consistent with heat rash, how to keep the affected folds dry, and which products are suitable for your child’s age. Ask what signs would suggest infection and when to return if cooling measures do not help.