CO2 laser treatment is an aggressive procedure, much like old-style dermabrasion that possesses the possibility for the subsequent development of dyspigmentation problems and even scarring. The hard science to support the use of Fraxel lasers lags woefully behind the heavy marketing and social media buzz for its use. So, buyer beware when it comes to this. On the other hand, TCA 15-25% has been used successfully for lightening all kinds of skin discolorations, including true freckles (ephelides). As to performing any kind of destructive treatment for real moles (nevi), this must be done very cautiously, since it is not rare for moles (often called "beauty marks" by the lay public) to actually not be as innocent or innocuous as they may appear. For actual moles, it is best for a sample to be sent to the lab to confirm that it is entirely benign before it is simply destroyed by any means, be it acid or laser, etc. You would be wise to make sure to consult with an experienced, board certified cosmetic dermatologist, as s/he is in the best position to help you with both confirming the diagnosis and with appropriate treatment. Hope this helps and best of luck.
