One of my hens stayed behind today and she was roosting alone outside the coop. So I went to put her in the coop and noticed she has bumps all over her comb. Don't know anyway other way to describe it. Its night time so I couldn't get a good picture so I hope the one I did take is good enough to identify what she may have. Is it a disease or illness and what can I do to help her. Also is it contagious to the other hens?