This information is provided by the National Institutes of Health (NIH) Genetic and Rare Diseases Information Center (GARD).
Rare lichen planus (rare LP) refers to several rare variants of lichen planus, which is a condition that affects the skin and/or mouth. The signs and symptoms vary by subtype but generally include an itchy rash. In most cases, the exact underlying cause of rare LP is unknown; however, studies suggest that it may be due to an allergic or immune reaction. Treatment is based on the signs and symptoms present in each person; however, intervention is not always necessary as some cases of rare LP resolve on their own.
For more information, visit GARD.