Comb Frostbite? Please help!!!

[MLchickens]

This is my first winter with chickens and I do not live in a particularly cold climate but I am worried that one of my girls, a red star chicken named Gertrude, has a frostbitten comb. I'm not sure, I've never really done this before. Any help or recommendations would be greatly appreciated. Thanks!

Here she is. It's the black stuff towards the back of the comb that I'm worried about. She wouldn't let me get a better picture.

 

[Eggcessive]

It just looks like some pecking to me. Here is a good link to read about frostbite, and here are some pictures to show early and late frostbite:
http://www.the-chicken-chick.com/2013/12/frostbit-in-backyard-chickens-causes.html

 

[MLchickens]

Thank you so much!!!