Table 1 Oral lichen planus diagnostic criteria^a

Clinical criteria

Multifocal symmetric distribution

White and red lesions exhibiting one or more of the following forms

reticular/popular, atrophic, erosive (ulcerative), plaque, bullous

Lesions are not localized exclusively adjacent to and in contact with dental restoration

Lesions are not localized exclusively to the sites of smokeless tobacco placement

Lesion onset does not correlate with the start of a medication or the use of cinnamon containing products

Histopathological criteria

Presence of band-like or patchy zone of cellular infiltration consisting mainly of lymphocytes in the lamina propria confined to the epithelium-lamina propria interface

Signs of basal cell liquefactive degeneration

Absence of epithelial dysplasia