Rashes on skin due to heat

Heat rash, also called prickly heat or miliaria, may cause clusters of tiny red bumps, clear spots, or an irritated prickling feeling. It commonly appears where sweat collects or clothing rubs, such as the neck, chest, back, underarms, groin, or skin folds. The skin may look red and feel itchy or stinging. See the related guides to [Skin Rash](/symptoms/skin-rash/), [Skin Bumps](/symptoms/skin-bumps/), and [Skin Redness](/symptoms/skin-redness/) for symptom descriptions.

Move to a cooler space, take a lukewarm shower, and pat the area dry rather than rubbing it. Wear loose, breathable clothing and change out of damp garments. Avoid heavy oils, thick occlusive products, and scratching until the skin settles. A bland moisturiser may support the skin barrier when dryness or rubbing is present; learn more about [Emollient Therapy](/treatments/medical-dermatology/emollient-therapy/). Do not apply a medicated cream to broken or infected-looking skin without advice.

Arrange a clinical review if the rash is spreading, repeatedly returning, very painful, oozing, crusted, or not improving after cooling and gentle care. Seek urgent help for trouble breathing, swelling of the lips or tongue, faintness, confusion, or a rapidly worsening widespread rash. A clinician can distinguish heat rash from infection, allergy, or another inflammatory condition and decide whether treatment such as [Topical Corticosteroids](/treatments/medical-dermatology/topical-corticosteroids/) is appropriate.

Ask what features support heat rash, whether a medication or product could be contributing, how to protect the affected fold, and what changes should prompt a review. Mention recent heat exposure, sweating, new clothing or skincare, and any drainage or fever.