I have a chick that was hatched about a week ago. The chick was active and appeared to be healthy like the other chicks. Yesterday I noticed that she seemed a little weak and I thought maybe she just wasn't getting enough food or water because she is a little smaller than the other chicks. However, as the day went on she struggled to walk without falling over. I went to separate her from the other chicks and when I picked her up I noticed a large bump on her left side by her neck. The bump feels bony and appears to be the reason she's falling over. The bump is large enough to throw her off balance. Does anyone have any idea what this could be? I worried that maybe she became injured from the other chicks running her over because she was fine up until yesterday and didn't have the bump.