Today I let my girls out for their usual foraging in the yard. My daughter came home from school and went to play with them, she noticed one with blood all over it. I was afraid a cat or something got one. After washing her off I found a hard round bulge on her wing at the elbow. It was picked off, her and the other chickens were pecking at it. Here is a picture. For now I have some gauze on it with neosporin and vet wrap. I separated her from the others so they wont pick at it too much. Any ideas? Thanks.