CD8A and oral lichen planus: Oral lichen planus is considered a T‐cell‐mediated inflammatory disease, and the infiltrating lymphocytes in the subepithelial region mainly consist of CD4+ and CD8+ T cells.7 Liquefaction degeneration of the basal cells is induced by apoptosis, which is primarily triggered by CD8+ T cells.8 However, its precise mechanism is unclear, and the antigen that triggers the inflammatory response of the T cells remains unknown.