It may be a fungus or ring worm as you called it. The area should be biopsed and analyzed to rule out other skin diseases. Go see a Podiatrist or a dermatologist for help.
Answered 11/23/2021
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If you have had no response to ketoconazole anti fungal cream, then it probably isn't a fungus ("ringworm"). See a dermatologist and get a proper diagnosis and treatment.
Answered 12/9/2021
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A doctor has provided 1 answer
3 doctors weighed in across 2 answers
A doctor has provided 1 answer
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