Not really sure where you have it, but I have a small patch at the base of my head where the bottom of my hairline is. in the past when it is really bad I use a tar shampoo (found in the shampoo aisle I think it's called TGel) I believe there is a gel-like lotion also available. there may also be a bar soap available. Check out the soap aisle in your local Walgreens or CVS. Hope this helps.
Try looking at this site, it has a lot of information about herbs that can help this condition:
mothernature.com/Library/Book…
You might also want to try looking up how nutrition can play a part in it. I found this site which talks a bit about it:
health4youonline.com/nutritio…
Hope it helps. Good luck!
Try taking Borage Oil capsules. do a web search on "benefits of borage oil" and you will read up on how in the last 20 years studies have shown that a lack of GLA can be the cause of eczema and psoriasis. You can purchase Borage Oil at any vitamin shop. and along with taking it you can also peirce the capsule and rub it in to the areas where you have the psoriasis.
I forgot to mention that Borage Oil is higher in GLA than flaxseed oil or primrose oil so therefore you don't need to take as much.
Hope this helps. Good luck!
Mangosteen 100 juice.