The purpose of this study is to evaluate the long-term course of patients with psoriasis and psoriatic-arthritis in systemic treatments such as, methotrexate, cyclosporin A, fumaric acids, acitretin, systemic PUVA, etanercept, infliximab, adalimumab and ustekinumab. A patient will be included at first initiation of the treatment and will remain in the registry for 5 years, regardless of subsequent therapy.