It is very important that your budgie be properly treated with the correct medication.
If you have more than one budgie they all need to be treated and the cage, perches, toys, food and water dishes, etc. will need to be thoroughly cleaned and disinfected.
Scaly face mites can be successfully treated using Scatt or Ivermection Spot-On Treatment.
With an advanced case of scaly mites, it may take more than one treatment.
Please contact your vet right away.