It looks like the kind of yeast infection every one of my bassets has had. I didn't have much luck with the allergy shots, either (or the wipes or the sprays or the shampoos). But what did work wonders was Apoquel pills. You might inquire about that with your vet. They're not inexpensive, but Costco carries them, which helps. I feel so guilty that my other bassets had to live with this when all I might have needed was a vet that could prescribe Apoquel. Good luck.