hello all i have a question. i cam home from work today and started feedin my chickens when i noticed something dark under one of my leghorns wings i picked her up to look more closey and its a deep nasty wound under her wing on her back it looks like its been there for a while it almost looks like something eating at the flesh. dont really know much about the chicken anatomy but i can see something in the wound where the skin is open. im not sure what could have caused this because she stays in a fenced in area with a rooster ans some other hens. she doesnt act like it bothers her she runs around, drinks and eats like a horse. do you think my rooster could have done this? disease? whats the best way to treat this sort of thing? any ideas and suggestions are appreciated!!