help!

i need some help, or rather, Diva does. the vets are basically guessing at what she may have, but despite many rounds of antibiotics, and creams and sprays and now a zinc supplement, the creeping crud remains on her. and is growing back. and is spreading. there's a somewhat graphic picture of it below, in case you happen to be a vet who's reading this, or know a vet that you can forward this to. 2 years ago-ish, she had a similar (but not the same) skin thing that was primarily in her ears and around her mouth. the head dermatologist at Cornell said it was a yeast/bacterial infection. diva's vet here thinks this may be the same, but it isn't responding to anything in a significant way. she had her leg shaved to get the moist scabbing off, and it seemed like it was clearing up, but now it's thick and cracked and caking up again. and it's on top of her head & on her neck & a hind leg now, too. there was a hard chunk under one eye that i finally got off her by holding a cold wet washcloth on it for a few nights to soften it up. now that area (after having healed) looks bloody almost, and is starting to get crusty. sorry - i know this is sort of gross, but i am as exhausted as diva with this whole thing. she is damn tired of wearing her buster collar, and i am nearly hyperventilating every time i think of how she must feel. plus, i'm a bit tired of the buster collar hitting me in the shins and back of the leg. so....help! now here's the picture, so don't look if you get queasy. it's the best i could do, since she gets absolutely Amish when the camera comes out, but the buster collar hid it till the deed was done. this is the side of her leg - from the front, it's even uglier. the fur gets almost pasty and stuck together, then forms a scabby thing. underneath, the skin looks bloody. around her head, the spots are dry & crumbly, and make an off-white hard scab-ish growth. so let me know if you have a clue what this may be - i appreciate any help, and so does Diva.