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Greetings,Thank you for your question. I am Dr. Su S. and I will try my best to help you.
Did you consult doctor or have any test?
I was waiting for your reply.As it does not appear to be typical ringworm, there can be other probables.There can be dermatitis, allergy.It can occur from contact with an allergen in swimming pool.I would advise to consult a dermatologist.Skin scraping can be taken for test.Hydrocortisone cream can help in those conditions.
You can try that.I hope this information will be helpful.If you have any query, please feel free to ask.If you are happy with my answer please click on the Excellent/Good rating. Wish you healthy life.Regards.