If you have sucking mites, you will have to treat the birds and their surroundings. The insecticide Pyrethrum powder is usually effective, but any good pet store will advise you on a suitable powder. Even if you do not think you have mites, dusting nest pan liners used by canaries or other finches with an insecticide powder is a good precaution against sucking mites. That is also helpful with nest boxes used by birds that have a tendency to accumulate a lot of nest material, such as quaker parakeets. The burrowing mites that cause scaly face and scaly leg are often associated with dirty cage conditions, but this is not always the cause.
Scaly leg causes disfigurement of the scales on bird's legs.
In scaly face, common in budgerigars, the scales on the cere become lumpy, dry and scaly, and the beak becomes deformed. The eyelids can also become infected. Check all birds for deformed beaks as an early sign of scaly face, especially budgerigars. The disease can become rampant if untreated. If caught early and liquid paraffin is applied to the infected areas, using a small artist's brush, the parasites can be eliminated.