My Peking bantam has been brooding for three weeks on her eggs, in doors on a mix of her feathers, straw and sawdust. When I let her out this morning for a quick bite to eat, I gave her the once over and noticed scale lift on her feet, they look scabby and irritated. How has this happened? She is in the house for security and freedom from the rest of the flock (no one else has it), the bedding is all clean and has come in to no contact with any other animals. Its also a plastic mammal cage she is in, thoroughly cleaned and disinfected before use, never had chickens in before. The out side coop with the rest of the flock is cleaned weekly and dusted for mites monthly. They are pretty much free range on grass and dirt. How has this happened and how do I cure it! Help