Hi, There is no permanent cure for psoriasis. But it can be checked nicely. Some small plaque psoriasis responds well & recurs rarely. Aggravation of psoriasis occur due to 1. Mental stress 2. Physical stress 3. Respiratory infection 4. Excess dryness Dandruff may be a part of it or it may be be a seborrhic one. So to reduce psoriasis you should 1. Reduce stress by yoga, meditation 2. In cough, cold consult doctor early 3. Apply moisturiser after bath when body is moist 4. Over scalp apply ketoconazole/coal tar/mild steroid shampoo Good luck