Why have my acne scars became pink and dark after CO2 laser and microneedling sessions

This is part of your healing process. I make it a point to stress out the healing of very patient BEFORE CO2 is used. Now, every skin type will differ, additional laser CO2 brand, passes, density, power, stacking, pulse duration etc...etc...etc.. will all differ. Your dermatologist will give you a time line for PIH- this can be up to 6 months in patient with fibrotic scars and darker skin types. For more info. ask your specialist as informed consent would have been done prior to the procedure. All the best, Dr Davin S. Lim