Hen’s comb changing from red to white rapidly

[JeepzPeepz]

I have a 6(ish) month old Australorp hen whose comb/wattles/ears keeps changing from healthy red to an extremely pale, almost white. This seems to happen mostly while she’s out and about, foraging in the yard. I first noticed this happening last weekend, and I thought it was frostbite so I brought her and her two sisters inside to warm up a bit and her comb went right back to a healthy red. Other than her comb color, she’s acting completely normal and healthy. She’s eating and drinking, solid poops, and happily maintaining her place as top hen. She also started laying very healthy-looking eggs within the last two weeks. She eats Layena feed and water, gets a handful of scratch to share with her sisters 2-3 times a week, has access to grit, etc.

What could he causing the rapid change in color? Is this normal when it’s cold? It seems odd (and concerning) that it mostly only happens when she’s up and active. I’ve attached the best pictures I was able to snap when she was looking pale, along with one where her comb was redder. The discoloration affects the entire comb, and it’s not localized like with frostbite. Any input is appreciated!

First pic is when it’s red, the others are when she’s pale.

 

[sourland]

She appears to be a pullet in excellent condition.

 

[CoopBoots]

My hens also change comb color pretty frequently, along with my rooster. I'm sure you'll get better input from other folks here but nothing in the pictures you posted looks abnormal or alarming to me. I haven't quite determined what influences color changes the most, but stress and excitement levels do seem to be a factor.

 

[Ashllen]

I always assumed it's because they use their waddles to manage their tempatures? Inside they are toasty warm so it is pumped full of blood to cool down and re-enters the rest of the body. Outside they are cold so less blood in their waddles to preserve heat, Meaning less red.