Heat rash after a sauna

The bumps may be tiny, raised, red or skin-coloured, and clustered where sweat and clothing hold heat, such as the chest, back, neck or skin folds. Stinging or itch can be more noticeable after you leave the sauna. A rash can resemble other causes of skin bumps or skin redness, so its appearance alone cannot confirm the cause.

Leave the heat, rinse with cool or lukewarm water, and pat the skin dry. Wear loose, breathable clothing and keep the affected area dry. Avoid another sauna session, heavy creams, fragranced products and vigorous rubbing until the skin feels settled. A light, bland moisturiser may reduce dryness; ask a pharmacist or clinician whether emollient therapy suits your skin. Do not apply a steroid cream unless a clinician recommends it for this rash.

Arrange medical advice if the rash is spreading, very painful, repeatedly returning, or not improving after cooling and avoiding heat. Seek urgent help for facial swelling, trouble breathing, faintness, confusion, severe weakness, blistering over a large area, pus, or fever. These features may point to a heat illness, infection, burn or allergic reaction rather than uncomplicated heat rash.

Ask whether the pattern fits heat rash, whether any product or medicine could be contributing, and when it is safe to return to sauna use. You can also ask whether a treatment such as a topical corticosteroid is appropriate if itch persists.