Heat rash after working out

Sweat, friction and tight sportswear can block or irritate sweat ducts. Bumps may show on the upper chest, back, neck, waist or areas beneath equipment. Itching and prickling after exercise fit heat rash, but hives, contact dermatitis, folliculitis and other skin rashes can look similar. Note whether the eruption follows clothing seams, a product or a particular workout environment.

Stop or slow the session if the skin is burning or prickling. Cool down in a shaded or air-conditioned place, shower with lukewarm water, and change out of damp clothing promptly. Pat dry, wash workout gear regularly, and choose breathable fabrics with less rubbing. Avoid scratching, heavy oils and fragranced body products until the area settles. A simple moisturiser may soothe dryness; ask a professional about emollient therapy if the barrier remains irritated.

Book medical advice if the rash does not improve after avoiding heat, keeps returning, or develops pain, pus or marked swelling. Stop exercising and seek urgent help for confusion, faintness, severe weakness, vomiting, breathing difficulty, facial swelling, or rapidly worsening symptoms. Those signs can indicate heat illness or an allergic reaction rather than straightforward heat rash.

Ask whether your sportswear, detergent, equipment or training environment may be contributing, and how to resume exercise safely. If itch continues, ask whether a topical corticosteroid is suitable and how to use it.