Lichen planus shows in many different ways. . The most common signs are white patches on the lining of your mouth (usually your cheeks, tongue and gums). These don't usually hurt, but sometimes there can be redness, ulcers or, very rarely, blistering as well as the white patches. If so, you may find it painful to eat hot or spicy foods.
There may be some connection between oral lichen planus and cancer of the mouth in perhaps 1% to 3% of patients who have had the condition a long time. The exact connection between oral lichen planus and cancer is not certain, and only a very few patients with oral lichen planus ever have such complications.
As the cause is usually not known it is impossible to stop oral lichen planus happening. To avoid the risk of serious disease of the lining of your mouth:• don't smoke. • don't drink large amounts of alcohol. • do have a diet with plenty of fresh fruit and vegetables. Everyone, whether they have oral lichen planus or not, should clean their teeth regularly twice a day with a fluoride toothpaste. They should also have their teeth and gums checked regularly by a dentist so that any changes in the lining of the mouth can easily be spotted.