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Yes, this could be bumble foot.
It’s caused by a cut or abrasion on a chicken’s foot which becomes infected. After it is infected, it will begin to swell. It then is covered by a bad bacteria that can be harmful to humans so watch what you do when treating a chicken with bumble foot. It’s possible to prevent bumble foot by keeping your flock safe from abrasion. Also keep your chickens’ roosts smooth and free from splinters. Another thing to do is frequently check your chickens’ coop and run for any nails, glass or other objects that might harm their feet.
The key to treating this problem is finding it early. Then soak the foot with warm water and epsom salt to soften it. Next, squeeze the foot pad area and remove the splinter. (If there is white puss coming out, continue to squeeze as this is the infection.) Apply hydrogen peroxide to the wound and wrap it up with a bandage. Use chickweed and rosemary after the process as these are calming and pain reliving herbs. (You may also have to keep the bird secluded from the rest of the flock until he is ready to not have a bandage on his foot. In other words, the flock members will more than likely peck at the bandage and cause more stress on him.)
Here's some links too.
http://www.fresh-eggs-daily.com/2012/03/bumblefoot.html
http://www.the-chicken-chick.com/2011/07/bumblefoot-causes-treatment-warning.html