Fowl pox? frostbite?

[Chickianado]

Hello experienced chicken-keepers! We noticed the other day that our Australorp hen had a black spot on her comb, surrounded by a slightly paler area. I did some Googling and convinced myself it was a spot from being pecked, but today one whole peak of her comb has turned black and there are a few other black spots too. Is this fowl pox? Could it be frostbite (it's getting under freezing here at night but their coop is well ventilated)? Should I isolate her or take her to the vet?

 

[Aapomp831]

That is dried blood from pecking... nothing to really worry about. You can see in the one pic where the wound bled down the comb. I would just leave it alone. No need to separate unless the other hens are relentlessly bullying and causing serious harm.

 

[Littledott09]

that or mites

 

[Aapomp831]

that or mites
[/QUOTE

That’s highly unlikely. Mites prefer to stay warm and hidden under feathers. You’ll find evidence of a mite infestation under the feathers and near the vent.