Here's a great website on bumble foot info:
http://www.hobbyfarms.com/livestock-and-pets/how-to-treat-bumblefoot-in-chickens.aspx
Best wishes to you and your flock!
The same thing happened to my Leghorn hen just a few weeks ago. As soon as I noticed the injury, I set up a small dog crate in the garage and stuck her in there. Trust me, its necessary to do this because if you don't, the other hens will peck her until (heaven forbid) death. You CAN put a...