Background: Combined micro-needling with platelet-rich plasma (PRP) is an effective treatment option for atrophic post-acne scars. Lyophilized PRP (L-PRP) is a novel, simpler, standardized preparation of PRP. The combined treatment of post-acne scars with micro-needling and L-PRP hasn't been previously investigated.Objectives: This study aimed to compare the effectiveness of the combined use of micro-needling and L-PRP versus micro-needling only in treating atrophic post-acne scars. Patients and methods: This randomized controlled split-face study included 20 adult patients with post-acne atrophic scars. One side of the face was treated with micro-needling. The other side was treated with micro-needling and L-PRP. The treatment was applied at 2 weeks intervals for 3 sessions. The assessment was done with Antera 3D ® camera analyzer. The mean indentation index of each side of the face was calculated before and two weeks after the last treatment. Results: Our study showed that the mean age of patients was 28.35 ± 4.87 years, 90% were females, and 20% were males. 50% had Fitzpatrick skin type III, while the other half had skin type IV. Both micro-needling monotherapy and combined micro-needling with L-PRP produced significant improvement in the mean indentation index of atrophic postacne scars. However, the mean percentage of improvement was higher in the combined treatment group. Side effects were minimal and transient with both treatment modalities. Conclusion: Combined treatment with micro-needling and L-PRP showed superior results in improving atrophic postacne scars and is regarded as a safe, simple, and cost-effective treatment modality.