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If you live in or near a farm area try to call a livestock vet instead of a regular, come to office type of vet, you'll get more realistic advice from the farm vet. They usually don't rake you over the coals so bad either. The other thing you could do and this is my suggestion is go this section...

Looks a lot like bumblefoot. Which is a bacterial infection. Here is an article on bumblefoot it's causes, and treatment options.

Unless you see an obvious injury I'd have to see a picture to give you any idea.