To compare the efficacy and safety of combined nanofat injection with either platelet rich fibrin or microneedling versus nanofat injection alone in the treatment of facial atrophic post acne scars.
Patients older than 18 years of both sexes with moderate to severe atrophic facial acne scars on both cheeks
1. Patients' age <18 or >45 years 2. Pregnant and lactating women 3. active inflammatory acne or active infection in the treatment area. 4. treatment of the targeted study sites within 2 months 5. history of chronic diseases (autoimmune diseases, bleeding disorders, taking anticoagulant therapy or aspirin) 6. history of hypertrophic scars or keloid formation tendency. 7. patients with unrealistic expectations.