I noticed today one of my barred rocks was holding a wing funny. I picked her up and above her "hock" (that's horse hock I don't remember what it's called on a chicken) is a red swelling, small, round like a ball, feels a bit hard but I didn't press too firmly. Little twig legs. Seems careful of walking on it. The chick itself is one of the smaller ones. There are some leghorn chicks and I think orphington chicks in there too. Can anyone give me a hint as to what is wrong with her leg and what care it needs? So far none of the other chicks have started picking on her yet. She seems to be getting to food and water okay. The chicks are on the medicated chick starter and on shavings.