I have had psoriasis on my scalp since the beginning of my teenage years. A couple of years ago it developed around my lips. I had to keep using hydrocortisone on it. Then I started using nettle moisturiser everyday and it has healed it! I never need to use hydrocortisone now. I guess it was quite mild to begin with but I thought it was worth letting people know in case they wish to try it.
I still have psoriasis on my scalp and use dovobet gel for that. I did buy some nettle shampoo hoping that would work instead but sadly it did not have the same effects.