I look forward to hearing others replies as I'm in a similar situation. I have three and maybe a 4th duck in various stages of bumble and I've pretty much quit soaking because either the original scab I went into and pulled out infection has healed, but there's still a lump next to it, or just a small bump under it. I feel pretty lost on the bumblefoot but the ducks aren't really limping and seem normal enough. I am bringing Polly back into the vet today for the doxycyline injection because her whole toe is swollen, except the part right by the nail where the bumble started. I'll let you know what happens. A very expensive experiment.