What should you know about oral erythrasma treatment?

Erythrasma is caused by Corynebacterium bacteria affecting areas where skin touches skin, such as the groin, armpits, or spaces beneath the breasts. Patches can look brown, pink, or red and may have fine scale, mild itching, or an odour. A clinician may examine the colour and surface, and sometimes use a special light or skin testing to distinguish it from fungal conditions.

Tablets are not automatically needed. The choice depends on the extent of the rash, previous treatment, other medicines, allergies, pregnancy status, and medical conditions. Oral antibiotics can interact with medicines and may cause stomach upset or other adverse effects, so do not use a leftover prescription or share medicine.

Arrange a dermatology or primary-care assessment if the rash persists or returns. If oral medicine is prescribed, follow the dose and schedule exactly and complete the planned course unless the prescriber changes it. Keep folds gently clean and thoroughly dry, change damp clothing promptly, and choose breathable fabrics. A clinician may also recommend [Topical Antibiotic Therapy](/treatments/medical-dermatology/topical-antibiotic-therapy/) for limited areas.

Seek prompt medical care if redness spreads quickly, pain becomes marked, the skin develops pus or open areas, or you develop fever or feel faint. Contact the prescriber urgently for facial swelling, breathing difficulty, severe diarrhoea, or a widespread blistering rash after an antibiotic.

Ask whether the appearance fits erythrasma or a fungal rash, why an oral option is suitable, which interactions matter, and how to prevent another episode in the affected fold.