I had Psoriasis on the hairline in the back of my head and around one ear.
Nothing worked until I tried coal tar shampoo, followed by a topical application of a coal tar lotion. IT WORKED and never came back. This condition followed severe emotional stress and breakdown of my immune system.
I was not professionally diagnosed as by that time I was sick and tired of doctors and took my health into my own hands. I read sometime later that the AMA had discovered a combination of coal tar and sunlight was the cure.