Berry (♀ Cockatiel) hatched June 2017
Opal (♂ Budgie) hatched 13 August 2017
Pearl (♀ Budgie) hatched 15 August 2017
+ an aviary of 16 other budgies! all hatched 2014-2017
I am no professional, but if you suspect scaly face/leg (Knemidokoptes), visit your avian vet ASAP! To me it looks like a possibility, and if caught early enough it is very easy to treat.
I highly recommend a visit to an avian certified vet for evaluation and treatment. If none is available in your area, perhaps a vet specializing in falconry, or a zoo?