American authors have surveyed complementary treatments including acupuncture for psoriasis. They studied 44 randomised controlled trials, 13 uncontrolled trials and 3 meta-analyses. One meta-analysis of 13 randomised controlled trials examined the association of acupuncture with improvement in psoriasis, and showed significant improvement with acupuncture compared with placebo.
Other helpful approaches were fish oil, curcumin, dietary modification, meditation and Chinese herbs.
(Complementary & Alternative Medicine Therapies for Psoriasis: A Systematic Review. Journal of the American Medical Association Dermatology, November 2018.)