IL17A and psoriasis: The anti-IL-23 biologics risankizumab (Clinical trial registration, KEEPsAKE 1, 2021; Clinical trial registration, KEEPsAKE 2, 2021), tildrakizumab (Clinical trial registration, INSPIRE 1, 2021; Clinical trial registration, INSPIRE 2, 2021), and guselkumab (Mease et al., 2020a; Deodhar et al., 2020) and the anti-IL17 receptor (IL-17R) antibody brodalumab (Mease et al., 2021a), which is already approved for psoriasis management, are under investigation in PsA, and the bispecific immunoglobulin bimekizumab, which targets IL-17A and IL-17F, is also being studied (Ritchlin et al., 2020a).