Investigators may enroll patients who have started on or switched to a systemic agent for psoriasis within the previous twelve months. Currently approved subcutaneous biologics are indicated for adult patients with chronic moderate to severe plaque psoriasis who are candidates for systemic therapy or phototherapy. The currently approved intravenous biologic agent is indicated for adult patients with chronic severe plaque psoriasis who are candidates for systemic therapy, and when other systemic therapies are medically less appropriate. All patients will receive standard of care treatments prescribed by the investigator, in accordance with the FDA-approved drug labeling, and all treatment decisions are the sole responsibility of the investigator.