Heat rash blisters treatment: what helps

Heat rash, also called prickly heat or miliaria, develops when sweat is trapped near the skin surface. Small clear or cloudy blisters may appear, often after hot, humid conditions or tight clothing. Blisters can break with rubbing, leaving tender skin. This pattern can resemble other causes of skin bumps or a skin rash, so location, itch, pain and recent heat exposure all matter.

Move to a cooler environment and let the skin dry. Use a cool, damp cloth briefly, then pat rather than rub. Wear loose, breathable clothing and pause strenuous activity until the area settles. Do not pop intact blisters; if one opens, rinse gently with clean water, pat dry and avoid adhesive products that trap heat. A light, fragrance-free moisturiser may reduce rubbing; see Emollient Therapy for general moisturising guidance. A clinician may consider a short course of Topical Corticosteroids when inflammation is prominent, but do not apply steroid cream to broken skin without advice.

Arrange medical advice if the blisters are spreading, very painful, repeatedly returning, or not improving after cooling and keeping the area dry. Seek prompt assessment for pus, increasing warmth, swelling, fever, red streaks or rapidly worsening pain, because these findings can signal infection rather than uncomplicated heat rash. Get urgent help for facial swelling, breathing difficulty or widespread blistering.

Could this be heat rash or another blistering condition? Should I use a moisturiser or prescribed anti-inflammatory cream? How should I dress or cover an area that has opened? What changes would mean I need an earlier review?