I have had Psoriasis on my scalp and other locations for over 15 years. It comes and goes like it does for most people. I have curly hair too so it makes project choices hard. Supposedly allergies and product sensitivity shouldn't affect the Psoriasis but I disagree. I recently tried with the dermatologist again and she prescribed Talconex. It seems to be helping. If I go too many days between applying it then it will pop back up. You might have your see her doctor and mention it. The good thing is I can wear black again
It is an auto-immune disease and one of the main triggers is stress. It's something that doesn't ever go away but can go into remission.
Hopefully that helps.