Partial unilateral lentiginosis(PUL) is a rare pigmentary disorder charaeterized by lentigines limited to one side of the body with or without neurologic abnormalities. We report two cases of PUL unassociated with any other defect, One patient was 20-year-old female who had lentigines confined to the right side of the face and the other was 19-year-old male who had lentigines confined to the left side of the neck and upper trunk and left upper extremity. Histologic examination of the pigmented lesion revealed findings consistent with lentigo simplex.