IL17A and psoriasis: Recently, the IL‐23/IL‐17 axis has been shown to play a pivotal role in psoriasis (Boehncke & Schön, 2015; Kopp et al, 2015; Burkett & Kuchroo, 2016; Lebwohl, 2019), and several negative regulators of this axis have been identified, including adaptor proteins and microRNAs.