Heat rash lasting for weeks: what to know

Heat, sweat, friction, and tight coverings can keep sweat ducts irritated. However, a rash that remains after the skin is cooler, changes texture, or spreads may be contact dermatitis, eczema, infection, or another eruption. Itching and prickling can occur with heat rash, while increasing pain, crusting, or drainage deserves closer assessment. Use the [Heat Rash](/conditions/heat-rash/) and [Skin Rash](/symptoms/skin-rash/) pages as general reading.

Keep the affected area ventilated, change out of damp clothing, wash gently, and pat dry. Use cool compresses and avoid scratching, tight straps, heavy ointments, and perfumed products. If a product or uniform seems connected, pause it when safe and note the response. Do not share prescription creams. A clinician can decide whether [Emollient Therapy](/treatments/medical-dermatology/emollient-therapy/) or [Topical Corticosteroids](/treatments/medical-dermatology/topical-corticosteroids/) fits the diagnosis.

Arrange a review when symptoms continue for weeks, recur despite trigger changes, or affect sleep. Seek prompt attention for fever, pus, rapidly spreading redness, marked warmth, severe pain, blisters, or swelling. A new or persistent pattern of [Skin Redness](/symptoms/skin-redness/) or [Skin Bumps](/symptoms/skin-bumps/) may need examination.

Ask whether the duration changes the diagnosis, whether a medicine or product could be contributing, and how long to try any treatment. Describe the site, sensation, triggers, and response to cooling.