I rescued a hen with really bad feet, she had lost all but one toe on each foot. Are the nails long and nasty? Does the foot smell? If it's a fungus, I really can't help. If it's the result of infection or cuts you can soak the feet in a dishpan of antibacterial soap (two squirts and a pinch of baking soda.) Then gently pat them dry, but try to get all the dirt/poo off. Spread Neosporin (non pain kind, regular) on a square no stick pad, place on the bottom of the foot, wrap w/ some gauze and tape the whole shebang with nonstick tape. All this stuff can be had at the local drugstore. Change every other day. You should see some pinkish skin(healing) and the dead skin will peel off eventually.
I think a pic of the feet would really help if you can get one. Good luck!
Oh, I forgot, you will have to trim the feathers on the feet first........
