What should you know about frequent heat rash?

Heat rash, also called prickly heat or miliaria, develops when sweat cannot reach the skin surface easily. Tiny raised spots, prickling, redness, or an itchy burning feeling may appear in skin folds, under tight clothing, or where skin rubs together. Hot weather, exercise, humid rooms, occlusive creams, and staying in damp clothing can all contribute. Repeated episodes do not by themselves identify another condition; the appearance and pattern matter.

A clinician may consider other causes when the rash is persistent, widespread, painful, crusted, or unlike earlier flares. Similar-looking skin bumps, redness, or rash can have different explanations.

Move to a cooler environment, rinse away sweat with lukewarm water, and pat the skin dry. Wear loose, breathable clothing and change promptly after exercise. Keep affected folds dry and avoid heavy oils, fragranced products, and tight straps over the area. A bland moisturiser may support irritated skin; see Emollient Therapy for more detail.

Do not scratch or scrub the spots. If inflammation is strong, a clinician may discuss a short course of Topical Corticosteroids, chosen for the body site and skin type. Recurrent episodes are a reason to review triggers and treatment rather than repeatedly applying products without guidance.

Arrange a dermatology review if the rash keeps returning despite cooling measures, does not settle, or interferes with sleep or activity. Seek prompt medical care for spreading warmth, marked tenderness, pus, fever, or rapidly worsening swelling, which can suggest infection or a different problem. Emergency help is needed for breathing difficulty, facial swelling, faintness, or a sudden rash with other severe symptoms.

Ask whether the pattern fits heat rash, which products are suitable for the affected site, and whether sweating, medication, work conditions, or another skin condition could be contributing. Bring a photo from a flare if the rash has cleared by the appointment.