Patients will receive either a gel containing both calcipotriene plus betamethasone or gel with no active ingredients as treatment for their scalp psoriasis for 8 weeks. After this time all patients will receive the gel containing both calcipotriene and betamethasone for 44 weeks. In addition, patients will receive an ointment containing both calcipotriene plus betamethasone as treatment for their psoriasis of the trunk and limbs for 52 weeks.