I have a beautiful and sweet leg horn that got dumped off at my place about a year ago. She's always stayed very healthy until a few days ago. She's been sitting up in the roost away from everyone for the last few days and today when I went to feed she came down and basically stumbled her way over to the feeder. Then stood up long enough to eat a little then later down in that spot until I picked her up and took her to the rehab cages. I can't decide if her feet a dark from frostbite or just dirt and she is always putting out her wings to keep her balance. She also has about a quarter size raw red spot on her back as well....can anyone help me figure out what this is, how I can treat it and if it will catch into the rest of my flock?