Laser may help. There are many different lasers which can be very effective but the results will vary depending on the chromophore, targeted tissue, energy, provider experience, etc.
Safe. Co2 fractionated laser is an excellent option to treat acne scars. Usually more than one session will be necessary for a marked improvement. Depending on the degree of scarring other procedures can be performed as well. The most common side effects is hyperpigmentation which is reversible overtime.
Lasers may help. I agree with dr. Chang. I would add that some lasers may not be recommended for darker skinned individuals.