I went out to the coop this morning and found that my rooster has frostbite on his comb. It has been really cold here for the last few days but the chickens stay mostly inside of the coop. I just put fresh straw down and there is plenty of ventilation. It does not look too bad but I covered it with Vaseline anyway. I was touching it and he didn't seem to be in pain. My biggest fear is that the part of the comb that has frostbite on it will die and fall off. Will this happen? Here are some pictures. Thanks!