I have 2 hens that have large combs and wattles and I have been putting vaseline on them every other day or so. It is 15 degrees here in KY. and although they still like to go out into the pen, I have noticed a small black spot on one of the combs and the color becomes pale on the other one. These hens are the ones that are both laying so far for me even with the limited light. Is there anything else I can do for the frostbite issue? Should I put the vaseline on every day without fail? I can't imagine it would hurt. Any additional suggestions aside from knitting them bonnets would be appreciated. Strange also is that my sikie couple like to be outside almost more that the other girls and I thought they did not handle cold weather as well as chickens with more closely packed feathers. Any one else notice that?