The purpose of this study is to evaluate primarily the safety and tolerability and secondarily the efficacy of topically applied WBI-1001 cream in patients with mild to moderate psoriasis. Double-blind, randomized, placebo controlled study of 36 patients, treated for 28 days plus a 7 day follow-up.in which the patients were divided into six cohorts: Cohort 1 at 0.5% QD;Cohort 2 at 0.5% BID; Cohort 3 at 1.0% QD; Cohort 4 at 1.0% BID; Cohort 5 at 2.0% QD; Cohort 6 at 2.0% BID.Efficacy assessed by PGA,target lesion assessment and BSA. Safety assessed through vital signs, ECG, AEs and Plasma PK via Cmin, Cmax,Tmax and AUCo-t.