You can also try soaking foot in epsom salts. Depending on where you live they may sell poultry antibiotic at your feed store. Most vets around here do not know anything about poultry. Blu kote is only topical and if you read the label the anti septic is alchohol. Okay I have this downloaded poultry book title Poultry Doctor. If you use homeopathic or want to try Here we go..."
"Bumble Foot.
This is caused by the foot getting hurt in some way,
bruised, or possibly a sliver run in it. It is often the
result of high roosts, the feet being injured when jumping therefrom, especially if the bird is heavy. The hurt part swells, becomes inflamed, pus forms, which in time grows hard and cheesy-like. The treatment is to wash the hurt clean, see that no foreign substance remains in it, then bathe in a lotion of one part Calendula tincture to five parts water, and bind up the foot as neatly as possible and keep bandage wet with the lotion ; or, in place of binding the foot anoint it with Calendula cerate, or lotion, and keep the fowl on clean straw. After operation give Hepar sulph. if hurt has not " gathered ; " if it has, give Silicea. During the few days necessary for healing, the fowl should be kept caged in a clean
place."
If you don't want to use homeopathic that's OK with me but this is an alternative answer. You can ask around various health food stores to see if they carry homeopathic.