Those appear to be healthy feet. Usually, scaly leg mites can be recognized by the scales separating and lifting up with filthy secretions under them. But if you are seeing anything that appears not to be normal, the treatment is very simple and easy.
The easy, cheap treatment is to slather on castor oil or petroleum jelly for about one week to smother the mites. Or you can use Elector PSP and dip the legs and feet for about five minutes one time to kill the mites. It's very expensive, though while castor oil and Veseline are just a few dollars.