“…However, immunosuppressants, such as cyclosporine, methotrexate, and hydroxyurea and biologic agents, such as TNFα inhibitors, successfully used only in selected cases of severe refractory psoriasis at the beginning, are slowly acquiring increasing importance in this subset of patients (Cepeda et al, ; Chiricozzi et al, ; Cobo Ibáñez, Zamora, Herranz, & Steiner, ; De Simone et al, ; Di Lernia, Zoboli, & Ficarelli, ; Lee et al, ; Morar et al, ; Paparizos, Rallis, Kirsten, & Kyriakis, ; Reddy, Shah, & Wu, ). Knowledge about their safety and efficacy are limited to case‐reports, small case‐series and studies, therefore, their use has not entered the routine yet.…”