Fractional CO2 laser resurfacing is a very good treatment for acne scarring. The small columns made in the skin are very good at stimulating collagen production, which can help with smoothing out old acne scarring. The issue with long wavelength lasers like Co2 is the potential for darkening skin in patients who have Type 4 skin like yourself. In New Mexico I have done a lot of fractional Co2 laser resurfacing on darker skinned patients, and for the most part we have had success in avoiding hyper pigmentation. Of course all patients are different, but here are a few strategies we employ to help prevent this complication.1. First, we select settings on the machine that tend to have reduced density and reduced energy. This is combined with phasing of the treatments to get the total energy into the skin we desire, but doing that over time instead of all at one time. Phasing allows us to get the total energy into darker skin with less risk. In patients who are very anxious about this issue, we can also do a test spot on a first phase of treatment to gauge response to the laser.2. The second part of treating patients at risk for hyper pigmentation is to selectively pre-treat with hydroquinone starting a week or two before the laser treatment. We do this less now but it is still an effective way both before or even after to manage this situation.3. Third, we are very selective about the products used in the post laser recovery process in darker patients. We have seen very excellent results with the Aminoplex/Bio2 line of laser recovery products. I feel the faster one heals and the better the post laser care, the lower risk of hyper pigmentation.4. Finally, the latest addition to our laser treatments in darker pigmented patients is combined use of PRP (TruPrp) with the fractional laser. Here we have noticed a trend to faster recovery, less hyper pigmentation, and better overall acne scarring response to the laser energy, allowing us to reduce settings even further.In summary, darker patients can be layered with CO2 as long as long as the practitioner has good experience with the procedure.