Oral lichen planus is a common mucocutaneous disease, characterised by bilateral white striations, papules, plaques on the buccal mucosa, tongue and gingiva. Erosive form may present as erosions or frankly ulcerated lesions, with characteristic radiating striae on the periphery of the individual lesions. Grinspan's syndrome is an interesting association of lichen planus, diabetes mellitus and vascular hypertension.