I have P on my scalp which also shows up in my ears. The scalp I can handle but the P in my ears makes me crazy.
Recently I purchased a new shampoo that my hairdresser uses. I always thought it felt and smelt nice :)
So I purchased it only to find out it has actually improved my scalp psoriasis. This shampoo had tea tree oil in it. Apparently studies show it does not help with skin issues but the last couple weeks have shown me otherwise. It also contains other natural oils so maybe it's the combination that helps.
Previously I had been using Neutrogena T-gel which in the beginning was the only thing that helped me but I would guess the coal tar isn't exactly healthy so the tea tree oil I hope is a better alternative.
Just thought I'd share in case this can help anyone else with these problems.