I was away for a few day and when I came home her feet were like this. My husband watched the babies and he noticed it on Sunday... I soaked her feet in salt water and put antibotics on them and she is in my bathtub now. They free range. The black spot is from dirt. I have also put peroxide on them as well. It looks like cuts. She is the only one with it. Any help, suggestions or advice is greatly appreciated.