I have one chicken who has had some lifted scales on her legs since we got her 18 months ago. After reading posts here, from time to time I will treat her as if she has leg mites (wash her feet with an old child's toothbrush, spray with a bird mite spray, then apply vaseline and rub it in) for a few days. It has never improved - just seems to always be the same. Over the summer, the other girls seem to develop the same thing and I have treated them all a couple of times (each time for a few days). Today one of the girls had a yellow looking substance on one leg that looked like stuck egg yolk. When I went to rub it, some scales came off. What gives?? Do scales peel or fall off when they get old? This is my first experience seeing that happen. should I do a different treatment?