I have three chickens; a barred rock, an ee, and a buff orphington; each chicken is 9 months old. All three birds appear healthy and have continued laying, even during the below freezing snap, that New Jersey just experienced, last week. My orphington is gorgeous, but a couple of the points on her comb are changing color....brownish gray, and feel dry. They are in a coop outside, that was kept above freezing, with a heat lamp, during the week of deep freeze. Any ideas of what I should do for her comb? What can it be? I'm new to raising chickens, so I feel anxious about the change.