Heat rash symptoms and treatment

Heat rash, also called prickly heat or miliaria, develops when sweat cannot reach the skin surface easily. You may notice tiny red bumps, clear fluid-filled spots, stinging, or itch in areas covered by clothing or skin folds. The neck, chest, back, waist, groin, and places where skin rubs together are common locations. Skin redness or a bumpy rash can have other causes, so appearance alone cannot confirm the diagnosis.

Move to a cooler environment, take a lukewarm shower, and pat the skin dry rather than rubbing it. Wear loose, breathable clothing and pause activities that cause heavy sweating until the area calms. Avoid thick oily products, tight bandages, and scratching, which can trap heat or damage the surface. A light, fragrance-free moisturiser may support the skin barrier; see Emollient Therapy for general guidance. A clinician may consider a short course of Topical Corticosteroids when inflammation is troublesome.

Arrange a medical review if the rash spreads, becomes painful, develops pus or crusting, or does not improve after cooling and gentle care. Seek prompt help for fever, marked swelling, severe tenderness, blistering, or feeling unwell. A clinician can distinguish heat rash from infection, eczema, contact irritation, or another cause of skin bumps.

Ask whether the pattern fits heat rash, which products are suitable for the affected body area, and how long to use any prescribed anti-inflammatory cream. Mention recent heat exposure, new clothing or skincare products, itching, pain, drainage, and whether the rash returns after sweating.