Oral lichen planus is a chronic inflammatory condition that affects the mucous membranes inside the mouth. It often appears as white, lacy patches or red, swollen areas, and can cause discomfort or pain. The exact cause is unknown, but it may be related to an immune system response. This condition can occur in anyone but is more common in middle-aged adults. While there is no cure, treatment options are available to manage symptoms, including topical medications and lifestyle changes. Regular dental check-ups are important for monitoring the condition and maintaining oral health.