hen's comb turned yellow, is this something to worry about?

[brygal5]

This is my second year with chickens and last week the temp dropped to -17 degrees. We haven't had such low temps before and i had read to put petroleum jelly on the combs and waddles of those birds with large ones to prevent frost bite. i did this when i heard the temps would get below 30 degrees. the temps raised back up by the end of last week, but i noticed 2 days ago that one of my white Leghorns had yellow in her comb. is this something i should worry about? the other hen still has a healthy red comb and all the hens in my flock are acting healthy, including this hen.
any ideas?

 

[Wyandottes7]

Your Leghorn probably got a little frostbite because of the freezing temperatures. Petroleum jelly can help prevent frostbite, but it doesn't alway work all the time. She'll probably be fine, though she may lose a bit of her comb.

 

[BantamLover21]

Could you post a photo? It is certainly possible that she got a little frostbite, despite you putting petroleum jelly on her comb. Petroleum jelly can help protect the comb from drafts/air and thus help keep it warmer, but it will not 100% prevent frostbite.

 

[brygal5]

thank you, i was worried it might be something worse! all i have read on here had mentioned the comb turning black, not yellow so i wasn't sure what it was.