Infliximab Biosimilar for Intravenous Drip Infusion 100 mg "Pfizer" Drug Use Investigation (Psoriasis)

This study will be conducted with all-case investigation system in patients with psoriasis vulgaris, psoriasis arthropathica, pustular psoriasis, or erythrodermic psoriasis. This study will be conducted in patients who used this drug after the day of approval of dosage and administration for psoriasis at contracted medical institutions. Patients who used this drug before conclusion of the contract with the medical institution will also be included in this study (retrospective patients will be included). Therefore, Time Perspective is retrospective and prospective.