Black tips on pullet’s comb?

[TheyBeChillin]

Hello! One of my pullets has a black tip on the top of her comb. When I looked it up, I saw that it was frostbite. However, it’s not cold outside as I live in the south in the middle of August so I’m not really sure what it is but it can’t be frostbite. This is my first time raising chickens so I’m kinda scared about it. At first, I thought it might be dirt, but it definitely isn’t. I thought y’all might be able to help! Thanks so much! Sorry it was difficult to get a good picture.

 

[nuthatched]

It's normal for young combs to have crispy tips. It's possibly a little sunburn.

 

[Eggcessive]

Could she be rubbing against some metal fencing or other material in her coop?