This is a 2-year, longitudinal, observational study of adult patients (ages 18 and above) being treated for moderate to severe plaque psoriasis.

Patients being prescribed or initiating medical therapy with a new biologic drug (such as risankizumab, guselkumab, brodalumab, tildrakizumab, ixekizumab, adalimumab, etanercept, ustekinumab, secukinumab, certilizumab pegol, infliximab, or apremilast) for the treatment of plaque psoriasis will be eligible for enrollment. The study will be conducted to gather data from enrolled patients' electronic health records, prospective physician-reported information provided by the patients' dermatologists, and information collected from questionnaires and surveys completed by the enrolled patients.

Patients will be screened and enrolled at a regularly scheduled clinic visit. Retrospective medical records from patients who provide consent/assent and meet all inclusion and exclusion criteria will be obtained by the research site. Records will include but will not be limited to: hospitalizations, emergency room visits, procedures, and medical costs. Physician reported outcomes will be recorded at regularly scheduled visits. Patients will also be asked to complete patient reported outcome (PRO) surveys and questionnaires to record data regarding demographics, clinical characteristics of psoriatic disease, comorbidities, family history, occupation and lifestyle factors, use of PsO support programs, contact information, concomitant medication use, medication side effects, and symptom characteristics.

During the follow-up period, the research site will prospectively submit the research subjects' medical records approximately every 3 to 12 months, for up to 2 years. Patients will be asked to complete PRO surveys electronically at regular intervals during this follow-up period.