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Cong Lin, Yang Rongya. Institute of Skin Damage and Repair, PLA Army General Hospital, Beijing 100700, China Corresponding author: Yang Rongya, Email: yangrya@sina.com ��Abstract�� Nail lichen planus ��LP��, an uncommon skin disease in clinic, can occur alone or in combination with cutaneous LP. There have been only a few epidemiological studies on nail LP, and its epidemiological features have not yet been clarified. Nail LP can be divided into 5 types: type ��manifests as typical skin lesions with nail changes, type �� as atypical skin lesions with nail changes, type �� as scalp lesions with nail changes, type �� as mucosal lesions with nail changes, type �� as nail changes alone. Nail LP has many characteristic clinical manifestations, such as pterygium. In clinic, nail LP should be distinguished from onychomycosis and other diseases that can cause onychodystrophy. The histopathological features of nail LP are similar to those of LP at the other sites, and dermatoscopy can be used for auxiliary diagnosis of nail LP. The treatment of nail LP is difficult, and specific therapies are unavailable. Systemic glucocorticoids are the only evidence?based treatment. Acitretin is effective for the treatment of nail LP, so are immunosuppressive agents, such as methotrexate and cyclosporine. The prognosis of nail LP is poor with frequent recurrence.