I have a broiler chicken that is 6 weeks old. She has a huge bubble on her chest that I thought was a ruptured air sac. I tried letting the air out by lancing it like I read to do on this site. It didn't work. Got a small amount off blood, but no air. She is half the size of the rest of the broilers. The lump didn't have any fluid come out of it, it is warm, it doesn't feel full of food like an impacted crop. I don't really know what else to try. The right size of her chest is biggest, but the left is also full of something. It is just half the size. Any suggestions would be appreciated. She is eating some, but gets pushed out the way by the bigger birds. I was going to seperate her today, but didn't know what was wrong. Didn't want her to gorge on food if that was something that could hurt her. Thanks in advance.