New systemic therapies for psoriasis.

Over the last decade, expanded understanding of psoriasis pathogenesis has led to the development of new systemic agents such as biological drugs that have revolutionized the treatment of psoriasis. Small molecule inhibitors also have been studied and offer patients options for oral administration. This article reviews recently approved and in-the-pipeline biologics (IL-17 inhibitors and IL-23 blockers) as well as small molecule inhibitors (phosphodiesterase 4 [PDE4] and Janus kinase [Jak] inhibitors).