as im having this scalp problem... ive tried many types of anti dandruff shampoo. not just shampoo, i also used anti dandruff hair gel. it seems to slow down the dandruff but not so efficient. last december, i went to a specialist doctor. on the first meeting, he suspected me for psoriasis. but not confirmed yet. i was given a medicated cream and a shampoo, selenium sulfide ( which is very stinks...). for me to use for a week. after a week, i went back to the doctor. since there is not much changes, so the doctor confirmed me having psoriasis. i was told to bought a new shampoo, polytar liquid(which is stinkier....). hopes for a better result.