But, more seriously, one of the best things for treating scaly leg mites is Campho Phenique.
Just brush it on the affected areas and repeat it about 2x a week until things start to clear up. After the first few treatments you can spread it out to about once a week since it really does a number on those little mites. They barely have legs at all and they can't move fast enough to get away from it.
I much prefer the "burn and suffocate them" approach to using a systemic poison like Ivermectin, but that method will also work.
Feather-legged breeds of poultry are especially susceptible to leg mites here in the Pacific Northwest so my Silkie chickens and I have had several battles with them.