摘要： Background: Different modalities have been tried for treating atrophic post traumatic scars. Objective: To compare the efficacy of microneedling combined with PRP with that of Fractional Er: YAG laser in treating post-traumatic atrophic scars. Methods: 45 patients with atrophic post traumatic scars were subdivided into three groups. Group I subjected to four sessions of skin microneedling followed by topical application of platelet rich plasma (PRP) immediately after each session. Group II subjected to the same protocol of treatment but for 6 sessions. Group III subjected to 4 sessions of Fractional Er: YAG laser at four weeks intervals for four sessions. Response to treatment was assessed clinically using the Quartile Grading Scale and histopathologicaly using H&E stain, trichrome and Orcein special stains. Results: All patients showed significant clinical improvement regardless of the treatment. There was a significant difference in clinical and histopathological improvement between group I and III, but there was no significant difference in improvement neither between group I and II nor between group II and III. Conclusion: microneedling could be as effective as fractional laser when combined with PRP and when used for more sessions.