A patient with well-defined erythematous lesions with some atrophy on the scalp and face and lichen planus papules on the limbs and sacral region is reported. The histopathological features and the deposits of immunoglobulins in the cutaneous lesions confirm the presence of both diseases. The difficulties of the differential diagnosis are due to the interaction between lupus erythematosus chronicus discoides and lichen planus probably occurring in the same patient.