The GentleLase is a 755nm Alexandrite laser, so it targets brown structures in the skin. It is mostly used to treat brown (or black) hair. It can also be used to target brown spots, and some brown spots are the result of sun damage. So in a sense "yes", it can be used to treat sun damage (but only the brown spots). It is not typically used for acne scarring and I would not expect it to dramatically affect acne scarring.
