Oral lichen planus Lichen planus is an itchy rash of small pink or purple spots that most commonly affects the arms, legs, lower back, or scalp. It may also affect the nails or the inside of the mouth (oral lichen planus).
If lichen planus affects the nails, they typically become ridged and loose. Oral lichen planus produces a lacy network of white spots on the inside of the cheeks. Treatment of skin lichen planus may include over-the-counter antihistamines to relieve itching.
A doctor may also prescribe topical corticosteroids or, if the scalp or nails are affected, corticosteroid tablets. Oral lichen planus may be treated with antiseptic or corticosteroid mouthwashes or corticosteroid tablet