Inclusion Criteria:  Patients with atrophic post acne scars on the cheeks, between 20 - 40 years old Not to apply other treatments a month before the procedure Informed consent to enter the study  Exclusion Criteria:  First grade of Goodman - Barron scale. A systemic or associated skin disease that may affect the results of the study patients with chronic consumption of nonsteroidal anti-inflammatory drugs (NSAIDs) or other non-aggregating agents. Patients with acne in the acute stage Pregnancy and breastfeeding Tendency to form keloids