Comb has turned white with scabs

[ShelleyBurch]

My white leghorn's comb has turned white on the top and started to scab. We had some very cold weather with windchills in the negatives. I watched the girls and everyone seemed okay, but then I noticed her comb turned white on the ends. It has some scabs that I can't tell if they are from the others pecking at her or not. Is this frost bite, or a fungus? My other girls already had their molt, but the leghorn's have not. She hasn't laid eggs in at least a week. Any help you can give us would be appreciated.

 

[theoldchick]

Frostbite.

 

[aart]

Ditto.... frostbite..best not to mess with it, may turn black and fall off or may be fine.