Tumor necrosis factor-alpha (TNF-α) has been implicated in the pathogenesis of many precancerous, cancerous, autoimmune, and inflammatory diseases including oral submucous fibrosis, oral leukoplakia, oral squamous cell carcinoma, systemic lupus erythematosus, rheumatoid arthritis, psoriasis, and OLP. Here, TNF is linked to oral lichen planus.