Sir, We present a case of adult lichen striatus in an atopic patient first diagnosed as lichen planus. A 34 year-old patient, known with atopic dermatitis since childhood, managed well with emollients, in good medical status, no drug intake, no background of allergy, was seen in consultations for a lichenoid unilateral linear eruption over the right superior limb. He declared no symptoms, the sudden onset of the skin lesions, and no recent medical events in his life. Close examination revealed lichenoid papules distributed in a linear mode, over the antero-lateral aspect of the right superior limb, no surrounding erythema, no scaling, and no scratching marks. Discrete xerosis over the body was also noticed.