Abstract
Verrucous xanthoma is a rare benign muco-cutaneous lesion, whereas oral lichen planus is a chronic inflammatory disease relatively common in the clinical setting. Verrucous xanthoma and oral lichen planus can reportedly coexist according to foreign literature. Owing to the low incidence of verrucous xanthoma and the rarity of co-occurrence of these two diseases, the mechanism underlying the co-occurrence of the two diseases remains inconclusive. In this work, a case of oral verrucous xanthoma complicated with oral lichen planus was reported. Related literature was reviewed to discuss the clinical classification, pathological classification, and possible pathogenesis of the two diseases.