Our rooster has had these "black circles" on his comb since we got him....about two months....this morning when I went out it was bleeding and the hens were picking at it!! I pulled him out and put vaseline on it....however I dont think it is frostbite as it is not the tips of the comb that are black....they are circles on the meat of the comb down low?? What is it?? any one know??? Could frostbite be down on the meat and not the tips?? and be a circle?? Thanks???