What should you know about erythrasma intertrigo?

Erythrasma commonly appears where skin touches skin, such as the groin, underarms, beneath the breasts, or between toes. The affected area may look pink, red-brown, or darker than nearby skin, with a fairly clear edge and fine scaling. It can sting, itch, or produce an unpleasant odour, but some people notice little discomfort. Moisture, heat, friction, and tight clothing can help the bacteria persist. A fungal rash can look similar, so appearance alone may not confirm the cause.

Arrange a clinical assessment if a fold rash is new, recurring, or not settling with gentle skin care. A clinician may examine the colour and scale and use a simple bedside test when the diagnosis is uncertain. Treatment may involve a prescribed antibacterial medicine applied to the skin; see [Topical Antibiotic Therapy](/treatments/medical-dermatology/topical-antibiotic-therapy/). Wash gently, pat the fold dry, change out of damp clothing, and choose breathable fabrics. Do not scrub, scratch, or apply steroid or antifungal products repeatedly without advice.

Seek prompt medical care if the area becomes rapidly more painful, hot, swollen, or tender, or if pus, fever, red streaking, or feeling unwell develops. Arrange a review when the rash spreads, keeps returning, cracks, or fails to improve after the recommended treatment. Odour can accompany a fold infection; persistent changes can also be discussed through [Body Odour](/symptoms/body-odour/).

Could this be erythrasma rather than fungal intertrigo? Which product should I use, where should it be applied, and for how long? How can I keep the fold dry without irritating it? What should I do if the rash returns?