As I was inspecting my flock of 9 33wk old hens (made up of NH Reds, Buff O, Bantums, Wyndotts), I noticed that one of my buffs had a growth on her left breast. More specifically, it was just under the neck and above the breast. I picked her up to ispect her and it is the size of a baseball (she is a big buff). I was very concerned. I then checked all of my girls and they all have the same thing. But different sizes. Is this normal? How come I never noticed it before. We have not changed anything in their diet. They are all on medicated layer pellets, they are all laying normally. They look healthy; they have bright red combs and are very active. What am I missing? Is is gout?