Heat-related rash: what you should know

Heat rash often appears in covered or folded areas where sweat remains against the skin. Tiny red or clear bumps may sting or itch. Irritation from clothing, deodorant, or sunscreen can resemble it, while atopic dermatitis may flare with heat and sweating.

A rash with a ring-like edge, marked scale, burrows, or intense night-time itch may point toward ringworm or scabies instead. Plaques that recur in typical areas can be consistent with psoriasis. The appearance, distribution, timing, and any new product or medicine help guide assessment.

Rinse away sweat with lukewarm water, pat dry, and change into loose, breathable clothing. Keep folds dry, avoid greasy products over the affected skin, and pause newly introduced fragranced products until the cause is clearer.

Do not pop bumps or scrub the area. If the rash spreads, returns, or does not improve after cooling and gentle care, arrange a dermatology assessment rather than repeatedly applying different creams.

Get urgent help for facial or throat swelling, breathing difficulty, faintness, blistering, skin peeling, or a rapidly spreading rash. Prompt medical review is also appropriate with fever, significant pain, pus, or involvement of the eyes or mouth.

Ask whether the rash fits heat rash, dermatitis, infection, or a medicine reaction. Bring a list of products and medicines, note when it began, and describe whether sweating, nighttime, friction, or sun changes it.