What is the difference between Sciton profractional and Erbium yag laser?

Rather than asking which expensive, supposedly "next big thing" gizmo is best for boxcar scars, one might instead ask which treatment has a long, proven record for elevating and smoothing boxcar scars that has stood the test of time for both efficacy and safety in all skin types. For that the answer would be subcision, a procedure I have been routinely performing since 1995 with gratifying results for elevating and smoothing all kinds of indented scars. As far as the light and energy-based, "bells and whistles" gizmos out there the science to support their use lags well behind the heavy marketing hype and social media buzz to promote them. A heavy dose of "buyer beware" should be exercised when considering them. Hope this helps and best of luck.