Definately looks like the beginings of scaly leg mites. Coat the legs in vasoline or other petrolium based product. VetRX works wonders too. I'd be dilligent and apply twice a day for at least 1 week straight. Dust or spray the roosts with poultry dust or poultry protector (all natural) or adams flea and tick spray with IGR. I have alot of feather footed chickens so i have dealt with this alot. VetRX works best for me or even vicks vapor rub would be good.