Frostbite

[ClickityChick123]

Hi everyone, one of my chickens has some black at the tip of her comb, and I'm wondering if it might be frostbite. I'm guessing it's not, but I was also wondering
1) What you do if they get frostbite
2) How to prevent it

Thanks for everyone's help!

 

[Wyorp Rock]

Looks like a minor scab. Probably from being nipped by another chicken.

I wouldn't worry about it, it will heal up on its own.