Lichen planus in the oral cavity: what to know

Oral involvement can affect the inner cheeks, gums, tongue, or other mouth surfaces. Some people see delicate white, net-like markings; others have red, tender, peeling, or ulcerated areas that sting with spicy, acidic, or rough foods. Symptoms can come and go. A mouth examination helps distinguish lichen planus from thrush, trauma, contact irritation, or other causes. Dental and dermatology teams may both contribute when the gums or teeth-cleaning routine are affected.

Use a soft toothbrush and a gentle toothpaste if ordinary products sting. Choose cooler, softer foods during flares and avoid tobacco, alcohol-based mouthwash, and foods that clearly trigger burning. Keep dental appointments and tell the clinician about mouth pain, medicines, and skin symptoms. Treatment may include medicine applied in the mouth, while [Topical Corticosteroids](/treatments/medical-dermatology/topical-corticosteroids/) or [Oral Corticosteroid Treatment](/treatments/medical-dermatology/oral-corticosteroid-therapy/) may be considered for wider or more active disease.

Book a dental or medical review for a sore area that does not settle, repeated ulcers, bleeding gums, or pain that makes eating difficult. Seek urgent help if swelling interferes with breathing or swallowing, or if you cannot keep fluids down. Do not assume every white patch is lichen planus; examination is the safest way to identify the cause.

Which part of my mouth is affected? Do I need a dental examination or a sample of the area? Which foods and products should I avoid? How should I use treatment safely, and when should the area be checked again?