I discovered this on a friend"s chicken while I was feeding/watching her farm. She is out of town. At first I thought it was from the rooster, but after I cleaned her up I discovered it was so much worse. I don't even know how to describe the severity of tissue damage....just really bad! It doesn't smell. It's not pus filled. It's not an animal attack. This is not fresh and had a very thick scab. What you see in picture is what it looked like after the scab was maybe knocked off by the rooster and then I soaked the rest off. Oh and I originally put bluekote on it, but then decided it needed to be washed more thoroughly with soap and water, then with betadine. This is located at the base of her tail. How do I treat this? Antibiotics? Cleaning? Treatment? AND WHAT IN THE WORLD IS IT??????? (I contacted owner and she has no idea, but has given the go ahead to treat as I see fit) HELP!!!!!!