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What are the reasons that lichen planus occurs?

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Lichen planus (LIE-kun PLAY-nus) is an inflammatory condition that can affect the skin, hair, nails and mucous membranes. On the skin, lichen planus usually appears as purplish, often itchy, flat-topped bumps, developing over several weeks. read more

Oral lichen planus can't be passed from one person to another. The disorder occurs when the immune system mounts an attack against cells of the oral mucous membranes for unknown reasons (autoimmune disorder). read more

For lichen planus that occurs in the mouth, the doctor may prescribe steroid lozenges or mouthwashes if mouth ulcer symptoms become uncomfortable. For lichen planus of the mucous membranes, treatment can be difficult to get right and may take years. read more

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