Soak with the epsom salt. Let the top get healed up, then you are going to do some bumblefoot surgery. You might want to order a few disposable scalpels online. Amazon has them, and they're not very expensive. Betadine solution (povidone-iodine solution 10% at wal mart), some gauze pads (I prefer the telfa non-stick ones), and some adhesive tape. You might want to get some vet wrap too.