H. pylori infection was also closely correlated to the erosive OLP (Li et al., 2021) as H. pylori infection increased the production of inflammatory cytokines IL-6 and IL-8, while these inflammatory cytokines may regulate the oral immune microenvironment through blood to exacerbate the inflammatory response in oral cavity (Du Teil Espina et al., 2019). Here, IL6 is linked to oral lichen planus.