Looks like Fungal infection
Welcome to WWW.WWWW.WW and thank you for posting your question.
I have seen the photograph of the lesion which you have attached, and it clearly looks like ring worm infection
(A type of fungal infection).
You would benefit from applying a plain antifungal cream such as meconazole or ketoconazole
, twice a day for a minimum of 4 to 6 weeks duration.
You might need a prescription to obtain this medicine, so do please consult your dermatologist
for the same.
Hope this answers your query, please do let me know if you need any clarifications.