IL17A and psoriasis: That the tumor necrosis factor-α (TNF-α) and IL-23/IL-17A axes appear to be major drivers in the pathogenesis of psoriasis is underscored by the excellent response of psoriasis to biologics targeting TNF-α, IL-23, and IL-17A, although a difference exists in their efficacy [46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61].