It looks like Taenia from the image .
Along with medicines and cream u need to take a lot of other things into care .
Always keep the area clean hygeniec and dry
Always use washed and clean, dry , and not too tight inner wears
Cream should be applied twice a day on a cleaned dried area ..
Even after complete visible remissiom cream should be contined for 1 week more to prevent recurrence .Total of minimum 3 weeks u have continue
If u have all of the above and still if the infection is growing ,then it needs further more investigation
Next Steps
Consult a dermatologist for further evaluavation
KOH mount of the skin scraping..C/S needs to be done to know the sensitive antifungal