this morning when i let our hens out of the coop, i noticed that one of our barred plymouth rock pullet's comb was bright red. upon closer inspection i saw that she is missing feathers on her rump and the skin there is also bright red, as are her feet. our temps drop down to the teens at night, but i checked and it was 24 degrees in the coop where they roosted all night so i'm not thinking frostbite. while i watched her, she walked around fine, but when she stopped, she would lift alternate feet, standing on only one at a time. one of the other pullet's feet are a little red but the other 12 look fine. any ideas??? Thanx!!