For scalp psoriasis, I now use warm olive oil. Warm in the microwave for 15 seconds or so, apply to scalp and wrap head in towel. I leave the oil in for an hour. I keep it warm by running the blow dryer over the towel. Rinse with regular shampoo and use a fine tooth comb to get the plaques out of your hair. Olive oil has worked wonders for my scalp.