What Causes Lichen Planus?

Lichen planus is a condition that produces lesions on the skin and mucous membranes. Some forms of the ailment also affect the hair and nails. Patients may notice they have itchy, purple lesions that spread across large areas of the body over several weeks or months. White streaks could form over the rash, and some lesions might blister. Painful ulcers may form in the mouth, and scalp discoloration and hair loss are common in cases where the disease affects the hair. In instances in which the nails are impacted, patients could experience thin, brittle nails, and nail loss may occur. Doctors are normally able to diagnose lichen planus with a visual inspection and physical examination.