My rooster has a black frostbitten comb too. I'm in south Louisiana so I didn't think I had to worry about this. The tips were black after a 27 degree night we had a few weeks ago, but the last 2 nights have been cold again and it's spread down to most of his comb. He's too mean to let me do anything about it. He attacks us to protect his girls. We are going to cull him after we hatch another batch of chicks (he is a daddy to 5 who hatched yesterday and today), but I hope he isn't in a lot of pain from the frostbite before that. My 4 hens have no sign of frostbite on their combs.
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