My chicken has a swelling on one leg and she can't put weight on her foot. Her other foot is slightly swollen, but not so bad. There is no evidence of bite marks. There are red spots and lumps on her skin. All the other birds have moulted and are ok, but she hasn't. She's taking food when I offer it to her, but she can't move around to get food. Does anyone have any idea what the
problem is? Photos are included.