Lichenoid tissue reactions of the oral mucosa.

The lichenoid tissue reaction (LTR) is characterised by epidermal basal cell damage and a variable subepithelial inflammatory infiltrate. There is a range of mucosal lesions exhibiting the LTR, chief of which is Oral Lichen Planus (OLP). The other oral lichenoid lesions resemble OLP clinically and histologically and at times it can be difficult to differentiate between the lesions. The important oral lichenoid lesions are reviewed in this paper.