Welcome to the board of Health Care Magic,Psoriasis
is a continuous recurring disease. It persists long, may be whole life.
Stop worrying for this disease, lead a cheerful life forgetting the disease, but in the mean time you have to take continuous treatment from your dermatologist
For itching he will give you some antihistaminc medicine and some steroidal cream. This will take care of your night itching.
Hope your query is answered