Table 1 The American Academy of Oral and Maxillofacial Pathology (AAOMP) proposed diagnostic criteria of OLP [3]

Clinical criteria

Multifocal symmetric distribution

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

 Reticular/papular

 Atrophic (erythematous)

 Erosive (ulcerative)

 Plaque

 Bullous

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

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

Lesions onset does not correlate with the start of a medication

Lesions onset does not correlate with the use of cinnamon-containing products

Histopathological criteria

Band-like or patchy, predominately lymphocytic infiltrate in the lamina propria confined to the epithelium-lamina propria interface

Basal cell liquefactive (hydropic) degeneration

Lymphocytic exocytosis

Absence of epithelial dysplasia

Absence of verrucous epithelial architectural change