That scabbing of the skin is the sure-fired sign that it is the northern or red mite, probably northern. From all I have read, it is the mites that suck the blood and irritate the skin so such a horrible degree to cause this yellow scabbing, and it can be reddish too. I saw that when I had the northern mite issues. I really believe that you had northern mite, even though you did not see many black dots. When I had those infestations, I did not see many black dots moving on the skin of the bird, but the feather shafts, oh those feather shafts.....northern mite Bigrock, I am positive (lice too, cause you did see them, they are very easy to see). Get some feathers from the area on the back of the bird just behind the legs and have a good look to see.....get some pictures, if you can, when you have time, if not, absolutely no worries. I think you got northern mite and the topical applications have caused mite death. have an awesome day, CynthiaM.