healed or cured?

a doctor told me that psoriasis can be healed, but there is no cure for it. i dont really understand this. but what i can see is... sumtime this thing just get better.. no scalp nothing.... but sumtime there is scalp everywhere....
so the conclusion is.... whenever the scalp appears... time for polytar shampoo :p
polytar shampoo is stinks.. but not as stink as you think.. actuallt it is quite some smell.... but i can bear with it.. more than i can bear falling scalps :p