Psoriasis Natural Treatments

Ever since I grew my hair long, I have increased psoriasis on my scalp, especially on the back of my head. Cutting my hair short is not an option because when it is short I get too many comments about looking boyish. Right now I use infusim shampoo, and it helps better than any of the supposed psoriasis or dandruff shampoos, but I am looking for a natural treatment that will increase the oxygen to my scalp and reduce or get rid of my psoriasis. I use hydrocortisone valerate cream to treat other small areas and it works great, but I can’t appy it to my scalp because it doesn’t get down in there. Any ideas?