If the infection is not taken out of the foot, then it can travel to the rest of the body. I don't know if your rooster's symptoms are from the bumble foot, but I've read untreated bumble foot can kill the affected bird. I treated a rooster with bumble foot last year by removing the infection.
Looks like bumble foot. You can do a search on this forum to get more information. The only way to cure it is to do a surgery to remove the infections yourself, or take him to a veterinarian for the surgery. Without surgery he will get worse.