I got a good batch 17variety of chicks on Sunday! They are awesome! BUT know I notice my 2white crested black polish keep getting pasted bum. I keep helping but now I see one has a enlarged right side of chest it seems like a cyst it is bulging out she seems to like it when I feel it??.... I worry or her they re so cute. They were def the smallest out of the whole batch I was worried they would be more stressed. Anyway I can help her and what is it?