Intertrigo Under the Arms: What to Know

Friction from the upper arm rubbing against the chest wall can weaken the skin barrier. Sweat, warmth and limited airflow then keep the fold damp. Redness, soreness, burning, itching, peeling or a raw surface may follow. A rash can affect one or both underarms. Small spots beyond the main rash can suggest an overgrowth of yeast; this is different from simple chafing and may need [Skin Yeast Infection](/conditions/cutaneous-candidiasis/). A wider overview is available under [Intertrigo](/conditions/intertrigo/).

Wash gently with lukewarm water and a mild, fragrance-free cleanser, then pat the fold completely dry. Change out of sweaty clothing and choose breathable, loose fabric. A clean, dry cloth or soft moisture-wicking layer can reduce skin-to-skin rubbing; replace it when damp. Avoid scrubbing, fragranced deodorants and picking at peeling skin. If a clinician identifies yeast, [Topical Antifungal Treatment](/treatments/medical-dermatology/topical-antifungal-therapy/) may be appropriate. Recurrent sweating may be discussed in relation to [Prescription Antiperspirant](/treatments/medical-dermatology/prescription-antiperspirant/), but do not apply irritating products to broken skin without advice.

Arrange a medical review if the rash is spreading, repeatedly returning, very painful, cracked, oozing or not settling with careful drying. Seek prompt care for fever, rapidly increasing redness, warmth, swelling, pus, a bad smell or red streaks. These features can indicate a more significant infection. A clinician can distinguish intertrigo from contact dermatitis and other rashes and select treatment safely.

Could this be yeast, bacterial infection or irritation alone? Should I use an antifungal, barrier product or another treatment? Which deodorant and fabric choices are least likely to trigger recurrence? What should I do if the skin becomes cracked or wet?