On the skin, it produces a reddish-purple, itchy rash with flat bumps or a white, lacy appearance.
In the
mouth, it can produce a burning sensation, sore
gums, tenderness when eating or toothbrushing and a metallic taste. Lichen planus isn't communicable. Theories about the cause of the disease propose it is an allergic or autoimmune response. Those with hepatitis C are at increased risk for contracting lichen planus.