Comparison of Picosecond Pulsed Nd:YAG Laser and Fractional Laser for the Treatment of Acne Scars

Inclusion Criteria: * Subjects with facial atrophic acne scars * Subjects who observe the schedules and protocols of the clinical trial * Subjects who give informed consent to participate in the clinical trial Exclusion Criteria: * Subjects who have active acne under treatment * Subjects who had received any other treatments for acne scarring for 6 months prior to the first treatment * Subjects who underwent other treatments including chemical, mechanical or laser resurfacing during the study period * Subjects who have current acute illness * Subjects who are considered inappropriate for the clinical trial under the judgement of investigators