IL23A and psoriasis vulgaris: Risankizumab is a humanized IgG monoclonal antibody inhibitor of IL23 recently approved by the EMA and the FDA for the treatment of moderate to severe plaque psoriasis in adults who are candidates for systemic therapy; and alone or in combination with methotrexate for the management of active psoriatic arthritis (PsA) in adults who have had an inadequate response or who have been intolerant to one or more disease-modifying antirheumatic drugs [12].