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It's not the cold so much as the humidity. Even at moderate temps (30's) there is a possibility of frostbite when you factor in the humidity and the wind chill. All three conditions were present today so that is what I suspect was the causal factor, but I'm not 100% certain.
The known facts are no metal surfaces to contact with; blood on the plastic water containers where a comb would likely touch when the hen drinks and the 2 hens with the large combs have black tips on their combs. It may just be a coincidence. But... Anytime one sees blood where it shouldn't be should investigate where it may have come from. Thus, blood on the water container made me take a close look at the critters that use it. I don't think I'm being over-protective; I think I'm being pro-active in finding the cause.
The good news is that no chicken seems to be adversely affected but I would rather error on the side of caution as I am a steward in the welfare of the animals I share my home with. A little bit of balm on their combs is easily done, even if over-reactive.
I should also note that the egg that Gravy gave me today had a smear of blood on the shell, so the blood on the waterer really stood out. Maybe that led to an acute awareness of anything amiss, but I'll stand by my position of due viligence in caring for my little flock.
On the other hand, perhaps I can exploit this situation and get one of those coeds to come help me with a chicken boo-boo. And this time I can ask them out.
RaZ - I was hoping you knew that I was kidding you about being overprotective. I agree anytime you see blood requires a good examination of every bird to see where it came from and what first aid measures are required.