Pictures of frost bitten combs?

[naturababe]

Two of my hens have normal bright red combs. The third's comb looks like it got a little dusty. Is that frost bite? Last night and this morning are the coldest it's been here. They were outside fluffed up after I let them out this morning but I stuck them back in because the wind chill is really bad and I was worried about her comb.

 

[Cats Critters]

This is the best picture I have of frostbite, on a BR rooster:

 

[pipthepeep]

sounds like it might be frostbite...my roo's frostbite started out as just a small whitish-yellowish spot (kind of like a blister....), or it can start out as gray. it confused me at first because I have always read that frostbitten combs are is black....but it doesn't always start out that way. if you post pics on here, someone can probably give you a more definitive answer...