Heat rash self care: practical steps for relief

Heat rash, also called prickly heat or miliaria, develops when blocked sweat ducts trap sweat near the surface of the skin. It can cause prickling, itching, redness, or clusters of tiny fluid-filled bumps, especially in skin folds, under clothing, or where skin touches skin. See the related guide to [Heat Rash](/conditions/heat-rash/) for the broader picture.

Move to a cooler place and let the affected area dry. Use a cool, damp cloth briefly, then pat rather than rub. Wear loose, breathable clothing, change out of damp garments, and avoid heavy ointments or thick products that may further block sweat ducts. Do not scratch; keep fingernails short to reduce skin damage. A plain moisturizer may help dry, irritated skin; the [Emollient Therapy](/treatments/medical-dermatology/emollient-therapy/) page explains how these products are used.

Arrange medical advice if the rash is spreading, very painful, oozing, crusting, or accompanied by fever, marked swelling, or feeling unwell. Seek urgent help for trouble breathing, faintness, confusion, or rapidly worsening symptoms. A clinician can distinguish heat rash from other causes of [Skin Rash](/symptoms/skin-rash/) or [Skin Redness](/symptoms/skin-redness/).

Ask what is causing the rash, whether a medicine is suitable for the location, and how to prevent another flare during hot weather. Ask before using a steroid product, since [Topical Corticosteroids](/treatments/medical-dermatology/topical-corticosteroids/) are not appropriate for every rash or body area.