My chicken had a hard knot on the upper inside of her leg. It looks like it might be infected too. There is a blood spot on it. After I soaked her in epsom salt, I applied an ointment and wrapped it. She does not put much weight on it. Seems very painful. I’m worried about the knot and not sure how to treat it. Any advice would be helpful. I do have her separated from my flock. Here is a picture for reference. Thank you.