“…It has been highlighted that IL-4 downregulates Th1 and Th17 cells and, can modulate dendritic cells thus suppressing IL-23 production. In addition, it can inhibit the secretion of epidermal IL-1b and IL-6 from psoriatic plaques (Hahn & Ghoreschi, 2017;Safa & Paumier, 2019). A case of erythrodermic psoriasis (Tracey et al, 2018) and a case of guttate psoriasis (Gori, Caldarola, Pirro, De Simone, & Peris, 2019) during treatment with dupilumab have been reported.…”