IL18 and oral lichen planus: As shown in Figure 5A, the expression levels of IL-12 (p < 0.01), IL-18 (p < 0.05), and IL-1β (p < 0.05) were significantly elevated in OLP plasma, while the plasma levels of IL-25 and IL-33 were similar between the OLP group and control group (p > 0.05).