Thank you for your question. I use Thermage predominantly for facial skin tightening with good results on selected patients. Depending on the quality of your arm skin , the use of Thermage is questionable. Remember, the more collagen you have in your skin the better the result. If your arms( especially inner are) have very thin skin with stretch marks, you would not be a candidate for Thermage in my office. If the arm skin has been stretched from excess weight gain or loss, Thermage is a questionable treatment. If you are reasonably fit, have good quality skin, free from excess sun exposure, then Thermage may be a good non-surgical option.I wish you well !