What should you know about persistent heat rash?

Heat rash, also called prickly heat, often affects the neck, chest, back, waist, or skin folds. Tiny bumps may itch, sting, or feel prickly, and the area can become red after sweating. Tight clothing, heavy creams, prolonged heat, and skin-to-skin friction can keep sweat from leaving the skin normally.

A persistent [Skin Rash](/symptoms/skin-rash/) is not always heat rash. Pus-filled spots, marked tenderness, a sharply bordered patch, or symptoms outside sweaty areas may suggest infection, contact dermatitis, or another condition.

Move to a cooler environment, take cool showers, pat rather than rub, and wear loose breathable clothing. Change out of damp clothing promptly and keep folds dry. Avoid thick oils, fragranced products, and vigorous scrubbing while the skin is irritated.

A bland product may reduce friction once the skin is clean and dry; [Emollient Therapy](/treatments/medical-dermatology/emollient-therapy/) describes this category. If inflammation is strong, a clinician may recommend a short, appropriate course of [Topical Corticosteroids](/treatments/medical-dermatology/topical-corticosteroids/).

Seek medical advice if the rash does not improve after cooling and reducing friction, keeps returning, or develops [Skin Redness](/symptoms/skin-redness/) that spreads. Prompt care is needed for fever, pus, severe pain, blisters, marked swelling, or a baby who seems unwell.

Ask whether the pattern fits heat rash, whether a cream could worsen blocked sweat ducts, how to protect skin folds in hot weather, and which warning signs mean the diagnosis should be reconsidered.