Scalp psoriasis is the hardest to treat especially if you have thick hair like I used to. Originally my doc thought it was fungal and I was applying an antifungal cream to the back of my neck that was stinging and finally she told me it wasn't supposed to sting. I got a new diagnosis of psoriasis (which my mother has too) and tried some corticosteroid liquids. They absolutely work but have side effects if used long term. I *think* it was Elocon that I used but not sure as I have not needed it for a long time.

This may sound strange but have you tried changing your shampoo and conditioner? I switched to natural shampoo and conditioner bars and it made a big difference. I also use a hemp based conditioning mask 1-2 a month xx