Comb colouring - anything wrong?

[elpel]

Hoping for some advice on what may be wrong with one of my hens? We've had a cold winter here and over the past few weeks I've notice one of the hens comb go white near the top.
They're about a year old, eat and lay well. Rest of their comb is red and there doesn't seem to be anything wrong with her but I wanted to check.
Thanks

 

[sourland]

She may have had a slight case of frost bite. She now appears to be fine.

 

[Trish1974]

She may have had a slight case of frost bite. She now appears to be fine.

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