My DH and I were putting the chickens up for the night and we noticed that about 1/2 of them have lumps on their breasts. They SEEM to be acting ok, but I know that chickens don't show weaknesses until its too late. What is wrong with them? Do you think they have some sort of infection? Would it be contagious since 5 or 6 of them have it? What would cause it? Please help!! I need to know if my flock has some sort of contagious disease and what to do about it!!