This is how I do most bumblefoot:
https://www.tillysnest.com/2015/12/non-surgical-bumblefoot-treatment.html/?spref=pi
Soak the foot to soften it up, or you can also apply decolorized iodine (not the same as betadine, it's in the first aid section of the pharmacy) and wrap the foot overnight, that softens it up also, for removal. Remove the scab/lesion and any pus that is underneath. (good idea to where gloves when doing this, it's often staph) Flush it out well. All gunk has to be removed for healing. Fill the hole with plain neosporin, plain triple antibiotic ointment, or the duoderm gel mentioned in the article above. Wrap the foot to keep it clean and dry. Change the bandage daily, clean if needed, reapply the ointment and rewrap until you know it's healing well. If all the gunk is not gotten out it may regenerate (fill with pus again) and will need to be cleaned out again. Even small lesions can take a good amount of time to heal fully, it's often not a quick process. Once you are sure it's healing well the bandaging can be less frequently changed. I usually keep them covered until they are fully healed, with checks and bandage changes every few days. Don't bandage too tightly, just enough to keep it covered, you don't want to cut off circulation. Vet wrap or co wrap works very well with non stick pads over the hole, and if you wrap the foot and then around the lower leg/ankle it usually stays on well.