Yep...I found that out some years back when applying it to long standing scale mites on a rooster with a gimpy hip. He'd been limping like that for months and I think he might have been kicked at his previous place of residence, plus he was old. Not only did his limp disappear by the next day...
Any swelling to the feet or wound can be benefited by a soak with the epsom salts...it's takes the throb and pain out of it. The castor oil is a natural antibacterial, antimicrobial, antifungal, and even a natural insecticide...but it's also a great anti-inflammatory and will take the pain out...