Does my pullet have frostbite?

[Cloverr39]

I noticed about 3 weeks ago that my silkie pullet's comb has some grey on it. She has pink skin, so I don't think her comb is supposed to one day just turn half grey. Is this frostbite? Should I just leave it alone and keep an eye on it? I tried putting some vaseline on it once, but idk if that helped at all. This is my whole flock's (and my) first winter. Yesterday was the first cold night with temperatures dropping down to -1°C.
My coop stays open during the day and the chickens spend most of the day outside. At night I close the coop but the top of it and bottom of the coop door are open wich should provide ventilation. It is pretty muddy now though, so maybe all the mud creates more humidity?
I don't think it's affecting any of my other chickens. Most of them already have black/dark grey combs because they're silkies. My one bantam brahma is also doing great.

I don't have any better pictures at the moment.

 

[DobieLover]

That is not frostbite. Could be dry skin. You could rub some coconut oil into it if you want.
Unless you had zero ventilation in your coop and it was MUCH colder, I don't think this bird could ever get frostbite with such a tight comb.

 

[Cloverr39]

That's a relief. Thank you!

 

[SwampPrincessChick]

It doesn't look like frostbite to me. When some of our chickens' straight combs get colder than normal, it usually turns slightly purple or white.

 

[MysteryChicken]

Looks like pigmentation too me. Sometimes it'll show up later as they grow up.

 

[SwampPrincessChick]

Looks like pigmentation too me. Sometimes it'll show up later as they grow up.

I agree. Some of our pullets are getting more red on their waddles and combs, but they're healthy.

Also, certain breeds may have gray coloring to some parts of their combs and waddles!