الفهرس 
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Abstract
Introduction : Atrophic scar classically appear as depressions of the skin. It is reported to worsen with age due to the natural lipoatrophy which further accentuates the scars. Histologically, atrophic scars exhibit thinning of the skin with a loss of collagen, elastin and deep dermal fat which cause adownward traction pull of the epidermis. Fractional photothermolysis has been approved by United States Food and Drug Administration for treatment of different kinds of scars. On the other side, carbon dioxide therapy is an area of aesthetic practice that has been relatively under-researched, yet widely used. Carbon dioxide (CO2) therapy or carboxytherapy is the transcutaneous administration of CO2 for therapeutic purpose. It works in two different ways: it first fragilizes fat cells with a pressure traumatism, then, in second, CO2 leads to vasodilatation in the area where the gas is injected. This reaction to carbon dioxide injection gives a better oxygenation of skin layers with increased lipolysis capabilities. The end result is fewer fat cells and skin tightening. d The aim of work: The aim of this study was to Compare efficacy and safety of fractional co2 laser versus carboxy therapy in treatment of atrophic non- acne scars. Research Plan: This cross-sectional descriptive study was conducted on a total of 40 patients with atrophic non acne scars. Patients received previous treatment for atrophic scars were excluded. Patients suffer from any other chronic skin diseases were excluded. They were recruited from outpatient clinic of Dermatology, Andrology and STDs, Mansoura University Hospitals in the period between July 2017 and July 2018. In this study we had fourty patients with compatible age and skin colour.