Herbs, supplements, and skin treatments that people commonly use for psoriatic arthritis and related psoriasis include:
No medical studies prove that these will ease your symptoms, though. The Food and Drug Administration doesn't control these products, and they may not contain the ingredients listed on the package. Be careful, and talk to your doctor before taking any supplements.
Aloe vera
Apple cider vinegar
Capsaicin from hot peppers
Dead Sea salts
Oats
Oregon grape
Tea tree oil
Turmeric