One of my hens started having poor color in her comb and wattle (or whatever it's called) not too long ago, and I've noticed her feathers look unkempt as well. The other hens don't seem to bother her, and they let her eat just fine. They are livestock, not pets, so I don't handle them typically and she did seem have plenty of "fight" when I picked her up for the picture. Any idea what this is or what to do about it? In the attached photo her comb looks OK without having something to compare it to, but the other hens have MUCH brighter color. Her's looks almost white next the theirs.