Yes, that it scaly leg mites. I have 2 with those right now. I have been soaking their feet and legs in warm epsom salt water for about 10 minutes, and using a toothbrush to kinda brush the legs and feet while they stand in the water. This will help loosen the scales and actually remove some of the mites. If you look real good, you will actually see some of the mites floating in the water. Then, once their legs and feet dry, I use another toothbrush and brush onto their feet and legs, some olive oil, to smother the rest of the mites that are remaining. I have repeated this every other day for a week now. I will probably continue atleast 2 more times. Oh, I also sprayed their roost and nesting boxes with a permethrin spray and dusted everything else in their coop and run with DE twice, as well as removed all bedding and replaced it with pine shavings. (Mites don't like the pine).
There are many methods to treating for leg mites, but this is what I decided to go with. Some people us vaseline, Vicks Vapor rub, gasoline, Ivermectin, etc. This is my first experience with it, but I hear they are hard to get rid of. So, for now, I guess I will wait and see and go from there. Good luck with yours, in whatever you decide.