Poor boy....sometimes you do everything you can but those large combed chickens that are just to stubborn (or dumb) to come in from the cold and they just get frostbite. I have a (formerly) double combed hen like this. Stayed out in the freeing cold until the whole top of her head was a sheet of ice....The top of his comb will dry out and fall of on its own, in the meanwhile just keep and eye out for infection and otherwise leaving it alone. It will never grow back but it will round out and look ok after a while.
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