Inclusion criteria:  Thirty patients with mild psoriasis will be recruited from the Dermatology Outpatient Clinic, Assiut University Hospital. The diagnosis will be based upon the clinical characteristics of plaque psoriasis. Patients will be included after they have stopped any systemic therapy for at least 8 weeks and topical therapy for at least 2 weeks.  Exclusion Criteria:  Patients having cardiovascular, renal or liver diseases. Patients with photosensitive or psychological disorders or immunodeficient patients. Pregnant or lactating woman