The dandruff & itchies are currently under control with a topical conditioner, so that's what I'm focusing on at the moment.
No fungus, just super sensitive skin. I will not try anything "medicated" like Head & Shoulders unless my vet were to suggest it, as some shampoos, fly sprays, and even some common first aid products will cause enough skin welting and obvious discomfort that a shot of Dex is necessary. He is on feed through fly control and a rotation of the least irritating fly repellants, since bug bites cause massive welts and blisters, too. Good thing he's cute ;)