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What can I do about a recurring ringworm problem?

I'm a 22 year old female, and I noticed that I had a minor case of ringworm a few months ago, but wasn't able to treat it because I was out of the country and not near to medical facilities. I've treated it about 3 times since I've been home, and nothing is working to make this now large ringworm go away. What should I do about this persistent ringworm problem?
Contrary to popular belief, ringworm is actually not caused by a worm at all. It is caused by a skin fungus called dermatophytosis. It is treated with topical anti-fungal medication such as terbinafine or miconazole. The infection is typically quite sensitive to treatment, though your treatment duration may not have been long enough. I tell my patients to use the anti-fungal medication for two weeks. If it is unsuccessful, then an oral anti-fungal medication can be tried. In your case the treatment may have been unsuccessful because you have something else other than ring worm, or it wasn't treated for long enough. Other skin rashes such as contact dermatitis or atopic dermatitis can look like ring worm and would not respond to the topical anti-fungal medications. I suggest that you schedule an appointment to see a dermatologist. The reason I want you to see a specialist is that I want to make sure that you get an accurate diagnosis before you go through with any additional treatment. Things that look like ringworm but aren't may require special treatment. The dermatologist can take a close look at your rash and determine for sure what it is. Good luck.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under Zocdoc’s Terms of Service.

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