Lichen planus is an idiopathic, inflammatory disorder, which has a chronic, self-limiting evolution and affects the skin, the mucous membranes, the nails and the hair. The characteristic lesions consist of small, polygonal, erythematous to purple papules on top of which sometimes thin, superficial scales can be found. A 63-year old woman was admitted in our Clinic for erythematous papules and plaques situated on both legs (shins and feet). The lesions were well defined, thick, infiltrated and were covered with whitish scales. The patient had a strong itching sensation.

Alteration of nails was also present, but the oral and genital mucous membranes were not affected. Hematologic and biochemistry laboratory findings were within normal limits; the immunological profile showed the presence of antiHBs antibodies. Under treatment, the lesions improved in appearance, the itching was reduced and the scales were cleared.

Taking into account that this particular form of lichen planus is associated with a high risk of malignant transformation, the patient needs to be periodically evaluated.