You should see a doctor or dermatologist to confirm whether it is ringworm, as many skin conditions can look similar. Avoid diagnosing it yourself, as the wrong treatment may delay healing and sometimes worsen the condition. Keep the affected area clean and dry, and do not share towels, clothing, or bedding to prevent possible spread of infection. If it does not improve within 1 to 2 weeks or worsens, seek medical care promptly.