So I walk to the brooder to make sure the girls are okay before bed time and I find my chick audrina being pecked by the other girls and noticed she was bleeding for her behind! I immediately took her out of the brooder and separated her from the rest and examined her to see what was wrong! I took a wet towel and tried to wipe off the blood but she has a large bump on her behind which seems to keep bleeding! I don't really know how to explain it so I took this picture: I hope someone has seen this before and can tell me what is wrong and what I can do ASAP!!! Please any help would be greatly appreciated!