One of my hens has crusty dirt on the base of her feathers near the skin. But it is only on her tail feather area and under her beak and the upper sides of her neck. Today she has been sitting in the run, not sun bathing or anything, just sitting and sleeping, which is unusual for her. Any ideas of what it might be? Please keep in mind, I live in Italy. Here, chickens are looked at as food, not pets. There are no vets for chickens, no medicines, nothing. At least, not for individual chicken owners. I have to try and take care of my chickens with all natural things. If you have any advice on ways to better my chickens health as well as what might be causing the crusty feathers please share! I need all the help I can get. I'm still very new at having chickens, but I love them to death!