Suggest Treatment For Psoriasis On Legs

my name is Amulya Iam 21 years old I am suffring from Psoriasis from past 15 years.Im on treatment from that time! In the begining it was just a exima but recently from past 2 years my dr suggested me to take a treatment for psoriasis. I HAVE THIS PROBLEM ONLY IN MY LEGS..... I am fed up with this problem! PLZ DO HELP ME!