Thank you for sharing your question here! Stretch marks are usually challenging to treat and completely remove, but in general more recent stretch marks respond better to treatment compared with older stretch marks. Nonetheless, we still can get good results even from old stretch marks. Other important factors that can affect the response of the stretch marks to treatments include their color, thickness and depth. Usually colorful (pigmented), thicker and deeper stretch marks need more sessions of treatment. Fractional CO2 laser and micro-needling are effective tools that we have to treat stretch marks. In general, fractional CO2 laser is substantially stronger and more effective and it typically takes fewer sessions compare with micro-needling to see results. I hope it helps and good luck!
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