Roosters Comb Black

[Engine823]

Saw this issue tonight with my rooster. Have seen minor black before from pecks but this seems extreme.
Only rooster I have and only two hens. Temps a couple weeks ago in the high teens but chickens have an enclosed chicken tractor. Can't believe it's frost bite.
Rooster is eating and hanging with the other birds. Haven't notice him being since back in the summer when he had flystrike. I cured that and it healed nicely.
Any thoughts? All other birds seem ok

 

[Engine823]

Also he has been molting some

 

[Engine823]

Does anyone have any ideas on this??

 

[MysteryChicken]

That's blood, he was fighting, or was pecked real good by a hen.

 

[WIchickMama]

Maybe he got it stuck somewhere and had to break free? But I would agree, it looks like blood