"Psoriasis occurs due to inflammation and is a chronic skin disease that can occur at any age."
Since in my country it is not allowed to make recommendations, I will simply tell a story about bobby here.
Against inflammatory diseases bobby always takes MMS (and of course this is only bobby's personal view and although bobby would recommend CDS because of the bad taste of MMS) because it forces the body into an alkaline range, so to speak (please someone correct this if bobby should be wrong). And inflammation can only "thrive" in an over-acidified body. So Bobby would additionally change his diet so that he eat a healthy (and alkaline) diet.
Bobby would also apply Propolis externally on his skin at the same time to accelerate the healing process. Unfortunately, Bobby do not know whether there is anything about psoriasis in the book by Andreas Kalcker. But maybe others can say something about it too. ;D