Abstract
Atrophic scars that occur after surgical procedure or trauma are considered as a cosmetic problem for patients. Atrophic scarring results usually during wound healing with inadequate production of collagen and connective tissue. Factors that precipitate to the formation of depressed scars include: individual variations in wound healing, wound tension, tissue apposition, and scar contraction. To evaluate the safety and efficacy of PRP vs carboxytherapy in treatment of atrophic scars. This study included 40 patients with atrophic scars divided into two groups; group A including 20 patients received PRP injection, group B including 20 patients received CO2 injection. They received the treatment every 4 weeks for four sessions and had follow up for 6 months after the end of treatment. Skin biopsies were taken before and after treatment to evaluate clinical results. There was statistically significant difference between both groups in treating atrophic scars, regarding clinical improvement and patients' satisfaction with better results in group B. Histopathological examination showed significant expression of MMP-1 in group B more than group A. Both methods were safe and effective with minimal side effects with better improvement in patients treated with carboxytherapy than those treated with PRP.
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