It really annoys me when a vet doesn't diagnose the problem and just throws medications at it hoping something will work. You've given this vet two shots and still don't have any idea what is going on. I'd find a different vet, probably a veterinary dermatologist, and get an actual diagnosis.
Holly, Misty & their friend, Jake, the dog.
Onyx, Callie May, Maggie & Kobi forever in my heart.
Yes, I know I need a new signature pic...someday...