Sometimes bumblefoot is not a very confined central core, but rather has ribbony or stringy bits that thread out from the central core. Thankfully these kind seem to be less common, and I'm not sure why they happen, but I've got a roo that I'm dealing with now that is like that, it's been 3 1/2 months and his lesions were small looking on the surface when found. It's much harder to get it all cleaned out, and if any is left in there then it reforms, like what is happening to yours. I have been doing repeated clean outs and letting it rest in between. I've done three surgeries between the two feet and will probably not do more, being that it's threaded through the foot getting a good margin that way is nearly impossible without removing an enormous amount of footpad. I have done two rounds of antibiotics (penicillin and enrofloxacin) mostly due to the trauma to the tissue I have had to cause, I don't feel like the antibiotics did anything to further getting rid of the bumblefoot, just prevented a worse infection from spreading. His ribbons of infection threaded fairly deep into his foot in places and doing some pretty hard squeezing has gotten some of the deep stuff out. Once you know what you are feeling, you can feel the stuff in there as hard spots that shouldn't be there. I think being a roo, and having bigger feet, and more tissue there in general gives it more area to work into than it would in a smaller hen foot. I have tried every suggested treatment possible, and frankly have felt I've made more progress with cleaning out with a currette, flushing it out with an herbal tincture of bidens pilosa, and packing with manuka honey, then I put the honey on gauze put that on top, and wrap it. He is not out of the woods, but I am stubborn and will not give up on him unless it appears to have spread from the foot, then I will have to cull him. It seems to be coming back a bit smaller each time, so intend to keep plugging away at it. He is a perfectly happy roo right now behaving normally, except for soreness on the days I do a clean out of the foot. This info may or may not be helpful to you, but thought I'd share it anyway.
