A Study of WD-890 in Participants With Moderate-to-Severe Plaque Psoriasis

Who May Qualify: - Male or female participant aged 18 to 70 years(inclusive)at the time of willing to sign a consent form. - Diagnosis of plaque psoriasis for at least 6 months prior to the screening visit. ≥10% of BSA involvement at screening visit and randomization; - Psoriasis Area and Severity Index (PASI) score ≥12 and static Physician's Global Assessment (sPGA) ≥3 at screening visit and randomization Who Should NOT Join This Trial: - Participant has a nonplaque form of psoriasis (for example, erythrodermic, guttate, inverse, pustular,or drug induced psoriasis.) - Has uncontrolled arterial hypertension characterized by a systolic blood pressure (BP) ≥160 mm Hg or diastolic BP ≥100 mm Hg Note: Determined by 2 consecutive elevated readings. If an initial BP reading exceeds this limit, the BP may be repeated once after the subject has rested sitting for ≥10 minutes. If the repeat value is less than the criterion limits, the second value may be accepted - Class III or IV congestive heart failure by New York Heart Association Criteria - Participant with a history of chronic bacterial infections (e.g., chronic pyelonephritis, chronic bronchiectasis, or chronic osteomyelitis). Always talk to your doctor about whether this trial is right for you.