When is topical antibiotic therapy recommended for erythrasma?

Erythrasma is a bacterial infection that commonly affects warm, moist folds such as the groin, armpits, or spaces between toes. It can cause slowly expanding brown, pink, or red patches with fine scaling and mild itch or discomfort. A clinician may inspect the colour and scale, sometimes using a special light, because fungal rashes and dermatitis can look similar.

A topical antibiotic is most practical when the affected area is limited and accessible. More extensive, recurrent, or difficult-to-reach infection may need a different plan. Moisture, friction, sweating, and skin-fold conditions can contribute to recurrence, so treatment also includes keeping the area dry and reducing irritation.

Apply the prescribed medicine to clean, dry skin and follow the full schedule even if the colour fades early. Wash your hands before and after application, keep towels and clothing clean, and dry skin folds carefully after bathing. Loose, breathable clothing can reduce trapped moisture. Avoid using steroid or antifungal creams on the area unless a clinician recommends them, because the cause may need confirmation.

Tell your clinician if the rash is recurring, spreading, or appearing in several folds. Read more about [Topical Antibiotic Therapy](/treatments/medical-dermatology/topical-antibiotic-therapy/).

Contact a clinician if the rash becomes painful, hot, swollen, cracked, or produces drainage, or if redness spreads beyond the fold. Seek review when there is no clear improvement after the prescribed course, because the diagnosis may be different or another factor may be maintaining the infection. Repeated episodes also deserve assessment for moisture and friction triggers.

Ask how the diagnosis was confirmed, where to apply the medicine, how long to continue it, and which drying or skin-care measures are suitable. Ask whether other household items need cleaning and what to do if the rash returns.