Background: Psoriasis is a chronic inflammatory disease of high prevalence. In India the prevalence of psoriasis varies from 0.44 to 2.8%. Objective: This study is to evaluate the prevalence of mild to moderate psoriasis vulgaris among different age groups in outpatient department of dermatology unit of Sree Balaji medical college and research hospital. Result: In this present study out of 587 patients attended skin OPD with skin lesion or complaints, dermatologist diagnosed as 62patients with mild to moderate psoriasis vulgaris. Out of 62 patients 35 are male and 27 are female. Out of 62 patients, 21 patients (14 in male and 7 in female) have family history of psoriasis vulgaris.