What should you know about prickly heat under arms?

Underarms are warm skin folds where sweat, deodorant residue, hair removal, and clothing friction can combine. Blocked sweat ducts may produce heat rash with fine bumps, redness, stinging, or itch. However, an underarm rash can also reflect contact irritation, infection, or another inflammatory condition. Skin Bumps and Skin Redness are useful descriptions, not diagnoses. Note whether symptoms began after a new deodorant, shaving, exercise, or hot weather.

Wash gently, rinse away product residue, and pat the folds completely dry. Wear loose sleeves and breathable fabric. Pause deodorants, fragranced washes, and shaving until the skin recovers; avoid scrubbing, picking, and thick occlusive products. A cool compress may reduce stinging. If the skin is dry rather than moist, ask whether Emollient Therapy is appropriate. A clinician should guide any use of Topical Corticosteroids in a skin fold, because the product and duration need to match the area.

Arrange an assessment if the rash persists after removing triggers, spreads beyond the fold, becomes painful, cracks, smells unusual, weeps, or develops pus or crust. Fever or feeling unwell also warrants prompt advice. Get urgent help for facial or throat swelling, breathing difficulty, or a rapidly worsening reaction.

Could this be heat rash, product irritation, or infection? Which underarm products can I restart? Is a medicated cream safe in this fold? How can I prevent moisture and friction during exercise?