IL17A and skin disorder: 4) IL-23-treated resting macrophages present in psoriasis-like dermatitis and promote pathogenesis; and 5) IL-23-induced IL-17A, IL-17F and IL-22 expression in macrophages is dependent on STAT3-RORγT pathway, while the expression of IFN-γ in IL-23-treated macrophages was likely mediated by T-bet pathway.