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It's really not the temperature that's the problem, it's more of the ventilation of the coop. Sure, if its sub zero temperatures then you'll have some, but frostbite can also happen if it's moist and cold in the coop.

Looks to me dried blood or some frost bite. My roosters get this too, but are always okay. Put some petroleum jelly on the comb and the blood should come off in the next day or two. Or, if it's frostbite the jelly will help seal out the cold preventing more frostbite.