Heat rash in summer: what to know

Hot, humid air, outdoor activity and damp clothing make it harder for sweat to leave the skin. The neck, chest, back, folds and areas under straps can then become irritated. Summer [Skin Redness](/symptoms/skin-redness/) or [Skin Bumps](/symptoms/skin-bumps/) can have causes other than heat rash, including contact reactions and follicle problems. The timing and distribution are useful clues, but they do not replace an examination when the pattern is unusual.

Take cooling breaks, use shade or air conditioning, and change out of wet clothing promptly. Choose loose breathable layers, keep skin folds dry, and avoid thick occlusive creams or fragranced products during a flare. A cool shower or clean cool compress may reduce prickling; pat dry afterward. If dryness follows repeated washing, a bland [Emollient Therapy](/treatments/medical-dermatology/emollient-therapy/) product may be considered. Use [Topical Corticosteroids](/treatments/medical-dermatology/topical-corticosteroids/) only after professional advice.

Book an assessment if the rash continues despite cooling, spreads beyond heat-exposed or sweaty areas, or returns frequently. Seek prompt care for fever, worsening pain, pus, marked swelling, blisters, open skin or rapid change. If overheating is accompanied by confusion, fainting or difficulty breathing, seek emergency help rather than treating the skin alone.

Ask how to distinguish heat rash from another [Skin Rash](/symptoms/skin-rash/), which products are suitable in summer, and how to manage recurrence. Share details about outdoor exposure, exercise, clothing, sunscreen and new personal-care products.