Lichen planus is a chronic autoimmune condition affecting the skin, mucous membranes, scalp, nails, and genital areas, often causing itchy, inflammatory lesions and discomfort. Potential triggers include medications, viral infections, allergens, and stress. The condition may present in several forms, with management focusing on symptom control through topical or systemic therapies, lifestyle measures, and monitoring for complications such as scarring, pigmentation changes, and rare malignant transformation.