I doubt that he has fowl pox because it is winter in NJ, and there are no mosquitoes out. Mosquitoes carry fowl pox virus in warm weather.
It looks like it could have been damaged on some wire fencing, some pecking, or maybe some strange frostbite. A couple of tips look slightly frostbitten or blue. Usually frostbite occurs on the tips and upper part of the comb. The way the black area is surrounded by white which can be typical of an injury as they heal. So I am leaning more toward injury. Whenever frostbite is suspected, do not massage or handle the comb. It should heal in a few weeks if it is from injury.
View attachment 2042024