Please help. I have a 3 1/2 yr old hen that I keep seperate from the flock due to the rooster attacking her. I had to go away for three days, she was fine yesterday when I got home, but this morning she has this large bloody mass on her butt. What in the world could this be? She hasn't started laying again from the "winter break" and I thought due to her age she may be slowing down a bit. Could the be some kind of egg blockage? Any advise would be appreciated!