Hi ,
An itchy scalp can be so aggravating!! We're all different, but personally I've found coal tar shampoo very helpful. I also discovered that sulfates in my regular shampoo were really irritating my scalp psoriasis. I do have a prescription treatment (that doesn't contain steroids), however I hardly have to use this anymore since avoiding sulfates and using the coal tar shampoo occasionally. The prescription is called calcipotriol scalp solution, just in case you want to discuss that with your doctor.
I know quite a few of our community members have mentioned finding tea tree and/or peppermint shampoo and conditioner very soothing for the itch. Coconut oil is another popular remedy. I haven't tried these myself but I did want to mention them. I also wanted to share the following search results for our site: https://plaquepsoriasis.com/search?s=scalp%20treatment - there's a lot of information on the different ways of managing scalp psoriasis, which I hope will be useful.
I hope you'll get some more input from the community here. Please let us know if you find anything that helps. Best of luck! -Catherine, Community Moderator