What should you know about recurring ringworm?

Ringworm is a fungal skin infection, despite its name; it is not caused by a worm. A rash that returns in the same area may have been treated for too little time, may have been exposed again, or may not have been ringworm in the first place. Eczema, psoriasis, contact dermatitis, and other rashes can look scaly or ring-shaped. Infection can spread between body sites, and fungus in the feet or nails can provide a continuing source. A household pet or another person may also need assessment if several people develop similar patches.

Arrange a dermatology assessment when the rash repeatedly returns, spreads, or fails to improve with an appropriate product. The clinician may examine the scale and take a skin sample when the appearance is uncertain. Use prescribed treatment exactly as directed and do not stop as soon as the border fades. Keep affected skin clean and dry, wash hands after applying medicine, avoid sharing towels and clothing, and launder items that touch the area. Check for athlete’s foot or nail changes, and mention possible pet exposure. Topical antifungal treatment is often used for limited skin infection; oral antifungal treatment may be considered when infection is extensive, persistent, or involves areas that topical medicine cannot adequately reach.

Seek prompt medical advice for a rapidly expanding rash, marked pain, pus, fever, facial or scalp involvement, or infection in a child or someone with reduced immunity. A scalp infection can affect hair and needs specific treatment. Contact a clinician if the rash worsens after a cream, because steroid-containing products can alter the appearance of fungal infection and make assessment harder.

Could this be ringworm or another scaly rash? Does the skin need testing? Should feet, nails, household contacts, or pets be checked? How long should treatment continue after the area looks better?