That's bad bumble foot. Those bumps are staff infections. There is good info on here about how to treat. If you can get to vet, bactrim will help. Generic is called Smz/tmp I think. Ill pull it out tomorrow and give details. You need to clean their coop. Because its contagious. Don't feel bad it's not uncommon but can be fatal if untreated and gets in their bones. Do some research here on the site and then come back if vet is not an option and ill help where I can.