In addition, IL‐17 production by T cells in the ILN was significantly decreased in the Treg‐of‐B‐induced M2 group compared to IMQ group (Figure 6H) Therefore, Treg‐of‐B‐induced M2 macrophages decreased the Th1/Th17 response in a mouse model of psoriasis. Here, IL17A is linked to psoriasis.