What Is Oral Lichen Planus? Oral lichen planus is a long-lasting disease that affects your mouth, causing symptoms such as painful white patches, redness, and swelling. It doesn't go away ...

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Injuries to the lips and mouth Includes inner cheeks and the roof of the mouth (hard and soft palate) Front of the mouth includes the tongue. Also, includes the flap under the upper lip (frenulum).