I have 7 hens who are just over one year old. I had a problem occur with one of my girls who is a Barred Plymouth Rock. I couldn't find any information regarding her problem. She has a quarter sized fluid like sac attached from to her breast. She is not showing any signs of pain/lethargic but was getting concerned as i care for her health. My first guess was a breast blister or a cyst. I cant afford any crazy pet bills for a chicken even though they are all loved! I was hoping someone else had some insight to this problem and wasint the only one who has had this problem occur.