Lichen Planus is a chronic inflammatory condition that affects the skin, mucous membranes, nails, and hair. It often presents as purplish, itchy bumps on the skin or white patches in the mouth.Lichen Planus is a chronic inflammatory condition that affects the skin, mucous membranes, nails, and hair. It often presents as purplish, itchy bumps on the skin or white patches in the mouth.