If it was bumblefoot, it looks like the scab fell off. If there's swelling in the footpad, go ahead and squeeze the heck out of the footpad and see if any goop comes out. If not, soak the foot again for about 10 minutes. Then squeeze the heck out of it again, manipulate the footpad as best as you can to get the goop out. Then put iodine on the footpad....put neosporin on a gauze and cover the hole with it and wrap it up with duct tape. Remove everything in 2 days and see if the swelling has gone down. If not, repeat everything over again.
It should completely heal in about 5-6 days without your roo limpimg.