Lichen planus is a chronic inflammatory skin condition that appears as itchy, purplish bumps on the skin or white lacy patches inside the mouth. It can also affect the scalp, nails, and genitals. This condition is believed to be an autoimmune disorder where the body’s immune system mistakenly attacks its own skin or mucous membranes. While lichen planus isn’t contagious, it can cause discomfort, scarring, and persistent irritation. Managing triggers and reducing inflammation can help improve symptoms.