One of my blue laced red wyandottes came in last night with a really pale comb. We had a few frosty nights last week (I accidentally left the coop side door open, but it wasn't super cold), but it's been warm and off and on rainy since then. Everything looked fine on everyone up until last night, and one of the girls now has a weird pale comb. She's eating, drinking, foraging, and acting otherwise perfectly normal. Is this anything to worry about?