i hate to ask the obvious but are you sure it is demodex and not sarcoptic?
i would get the mdr1 if it is demodex and start the ivermectin
it is a miracle drug for demodex and quite safe in the scheme of things
And I would do this with a dermatologist. Your dog - if it is demodex - is not just a couple of patches, it sounds like it's going full tilt.
At that time she had it mostly on the lips, nose, and pretty badly under her chin. Her vulva was also very inflamed. She had lost all the fur on her chin when we visited the vet........She now has thinning hair around her eyes, bits of missing hair on her legs and paws with bumps and sores. I've also started to find little scabs here and there on her belly and armpits.
There is demodex, and 2 types of demodex: there is local and general. Generalized can get really bad.
on this link they have the link to the testing for the MDR1.
is the other mange, generally itchy.
It is possible to have both.
That is why I would want to see a dermatologist.
ACVD - Locator
You can definitely support her immune system, but please don't think that will do it when it moves from localized to generalized. A beautiful GSD came to IMOM years ago being treated by a vet with things like oxygenated baths and immune boosters and was too sick to respond to treatment once she got it.
Plus - if it is demodex and Revolution is being used, you need to see another vet, and it may as well be an expert. In some states, vet teaching hospitals are less expensive.