How do you cure a rash on your chest that clotrimazole cream and diflucan have reapeatedly failed to cure?

Maybe it is not a fungal rash, if it is not responding to those antifungal medications. Alternatively, it could be a fungus that is resistant to those medications. I assume you've seen a doctor, if you are taking Diflucan, so either go back and see that doctor or see a dermatologist. Hopefully one of them will be able to figure out what is going on and how to treat it. Good luck.