Why does intertrigo cause a skin rash?

Intertrigo affects areas where two skin surfaces touch, such as the underarms, groin, abdominal folds, or beneath the breasts. Repeated rubbing weakens the outer skin barrier. Sweat and limited airflow keep the area damp, so the irritated surface becomes red, tender, raw, or itchy. Once the barrier is disrupted, yeast or bacteria may sometimes grow more easily and change the appearance or discomfort of the rash. The pattern and surrounding skin help a clinician distinguish intertrigo from other causes of rash.

Gently wash the fold and pat it completely dry. Choose loose, breathable clothing and change damp garments promptly. Reduce rubbing with careful positioning of skin folds and avoid fragranced products on broken or irritated skin. A pharmacist or clinician can advise whether a barrier product, anti-inflammatory treatment, or antifungal treatment fits the appearance; different causes need different products. Avoid using a strong steroid or combination cream without guidance, because it can alter the rash or worsen an infection.

Seek prompt medical advice if the area is rapidly spreading, very painful, hot, swollen, cracked, draining, or accompanied by fever. Arrange an assessment when the rash keeps returning, does not settle with careful drying, or involves extensive broken skin. People with diabetes, reduced immunity, or difficulty caring for skin folds may need earlier review. A clinician can examine the fold and select treatment for irritation or an overgrowth of yeast or bacteria.

Ask whether the rash looks like uncomplicated intertrigo, whether a yeast or bacterial overgrowth is present, and which product is suitable for the exact fold involved. You can also ask how to keep the area dry, which warning changes should prompt review, and how to reduce recurrences.