What should you know about erythrasma symptoms?

Erythrasma commonly presents on the groin, inner thighs, underarms, beneath the breasts, or between the toes. Skin can become pink, red-brown, or darker, and the patch may have a defined margin with delicate scale. Some people experience itching or burning, while others mainly notice colour change. A musty or unpleasant smell may occur where moisture remains trapped. Blisters, marked swelling, or heavy drainage are less typical and should prompt assessment for another or additional problem.

Note where the rash began, whether it is spreading, and any products or medicines already used. A clinician can compare erythrasma with ring-shaped fungal rashes, contact irritation, and eczema; an examination or simple office test may help. If confirmed, treatment is directed at the bacteria, often with a prescribed topical medicine. Information on this option is available under [Topical Antibiotic Therapy](/treatments/medical-dermatology/topical-antibiotic-therapy/). Gentle washing, careful drying, and loose clothing reduce friction while you arrange care.

Seek prompt care for rapidly worsening redness, increasing heat or pain, swelling, pus, fever, or red lines extending away from the rash. Arrange a routine appointment when discolouration persists, returns repeatedly, or does not respond to the advised plan. If the main concern is an unusual smell, [Body Odour](/symptoms/body-odour/) offers related guidance; groin discomfort can also be reviewed as [Itchy Groin](/symptoms/groin-itching/).

Which features make you think this is erythrasma? Could another condition be present at the same time? Do I need a test? How should I monitor the colour, scale, itch, and odour while treatment is underway?