Solitary lichen planus simulating malignant lesions.

Four patients with similar cutaneous lesions clinically simulating Bowen's disease or basal cell carcinoma revealed histopathological changes of lichen planus. Examination by direct immunofluorescence was performed in two of the patients, showing ovoid bodies containing IgM, IgA and fibrinogen in one patient and IgM and fibrinogen in the other patient.