Refractory Psoriasis Vulgaris with Itching Successfully Treated with the Anti-interleukin-17A Antibody Secukinumab: A Case of Secondary Failure of Other Biologic Agents

Sir, A 60‐year‐old Japanese man with a 30‐year history of psoriasis vulgaris was referred to our hospital. His previous treatments, including topical corticosteroids, Vitamin D analogs, narrowband ultraviolet B, and cyclosporine, demonstrated poor disease control. At his first visit, he presented with scaly erythematous plaques on his trunk, extremities, and scalp, with considerable itching. At the time, his Psoriasis Area and Severity Index (PASI) score was 37, with an itch Numeric Rating Scale (itch NRS) score was 6 [Figure 1A].