Lichen planus

Lichen planus is a chronic inflammatory and autoimmune disease that affects the skin, nails, hair, and mucous membranes, characterized by polygonal, flat-topped, violaceous papules and plaques, as well as oral manifestations such as white, lacy patches or red, swollen tissues and sores. Although its exact cause is unknown, the condition is noncommunicable and can cause significant pain and discomfort, with various treatments available to manage symptoms.