Signs of Heat Rash in Adults

A [Skin Rash](/symptoms/skin-rash/) may appear after hot, humid weather, exercise, fever, or prolonged occlusion. Common sites include the neck, chest, back, waist, underarms, and areas where skin touches skin. Bumps can be red, skin-coloured, or filled with clear fluid; burning or prickling may be more noticeable than itch. Heat rash can resemble contact dermatitis, folliculitis, or infection, especially when the [Skin Redness](/symptoms/skin-redness/) is widespread or painful.

Move to a cooler environment, loosen clothing, rinse sweat gently, and pat the skin dry. Wear loose breathable fabrics and take breaks from activities that cause heavy sweating. Avoid thick oily products over affected areas. If dryness or friction is present, a clinician may suggest [Emollient Therapy](/treatments/medical-dermatology/emollient-therapy/); a short course of [Topical Corticosteroids](/treatments/medical-dermatology/topical-corticosteroids/) may be considered for selected inflamed rashes.

Arrange a review if the rash persists after cooling, repeatedly returns, becomes painful, produces pus, forms large blisters, or spreads beyond areas exposed to heat. Seek urgent help for confusion, fainting, severe weakness, breathing trouble, or very high temperature with hot skin. New [Skin Bumps](/symptoms/skin-bumps/) may need examination when their cause is unclear.

Ask whether the pattern fits heat rash, which products are suitable for your skin, how to prevent recurrence during exercise or travel, and what changes would suggest infection.