Help! dog has a sore, took her to vet, didn't work, bigger and now another one!! 10 points for best answer?

Sorry but the picture is not showing up. I think if it were me, I'd take her to a different vet for a second opinion. Until you know what the problem is, you won't be able to treat it. since the vet was wrong before, go to a different one. Maybe one that some friends or family recommend or use.