Your bird does not look particularly like it has scaly mites...I'm more of a hands on person than photo....but being a young bird, I am more suspicious with any raising of the scales (Older birds will get some of that simply with age and not have mites).
Vaseline can help if you apply thickly and then reapply regularly, every week, for about a month. You have to be very consistent in order for it to work.
My general advice for rescue birds is to apply Ivermectin for all possible pests within and without...it is a fairly broad spectrum medicine for most internal and external parasites. You may also desire to place the bird on a short duration of medicated feed during quarantine to help it transition to the coccidia of your soil...then of course to keep it in quarantine until all doses are administered and the bird looks completely clean and healthy.
If you do go the Ivermectin route, I recommend cattle pour on....couple of drops at the base of the neck and then couple of drops at the base of the vent being very careful to not get it into the vent. It requires 3 doses 7 days apart to cure external parasites and eradicate internal. Efficacy will be greatly influenced by not applying onto skin (get below those feathers to bare skin), not following through at 7 days, not applying 3 doses. You will need to pull eggs during dosage....egg pull is 7 days after each dose, so 21 days total.
LofMc
