It must be fungal infection called as tinea u will have to take antifungal medications and creams.course of medications will be 1 to 1 and half month.it is contagious so keep your soap towel seperate and wash your clothes seperately.
Next Steps
consult a dermatologist for treatment
Health Tips
donot go to medical stores and apply over the counter medications give by pharmacist as they contain steroid and will cause side effect and will not solve your problem.