my 80 year old fatherinlaw is a type 2, insulin dependant diabetic. He has neuropathy and no feeling in his feet. This morning I saw a fresh blister on his big toe. There is no sign of infection, but his feet are chronically purple so it's hard to assess. My plan- soak twice a day with epsom salts, dry carefully and wear clean cotton socks after each soak. Anything else I should be doing? Should he be on prophalactic antibiotics?