I was massaging a person once whose skin had a thick slightly oily feel, when I asked how come he said used to have Psoriasis and the doctor told him never to wash with soap, only ever wash with sorbelene and to avoid any form of sweet foods, even fruits (especially fruits) and to keep his carbs low and eat lots of green vegetables. he said after 1 year his Psoriasis was completely gone and he never returned to soap or sugar.
PS
easy on the Epsom Salts enemas, it rips the mucus membrane off the bowel wall. major inflamation risk there, more so for someone with a Psoriasis glitch. wouldn't advise anything other than pure water.