Can CO2 fractional laser remove post inflammatory hyperpigmentation caused by acne?

Post inflammatory hyperpigmentation is a result of overstimulation of pigment cells (melanocytes) during the inflammatory or healing phases of acne.  Although C02 lasers may improve scarring more effectively than other treatments, the heat generated from the laser might increase the hyperpigmentation temporarily.  I prefer combination therapy such as kojic acid and arbuten, along with cold lasers such as the 595 wavelength or laser toning procedures such as the pico or q switched devices

In my opinion, you have three issues in your question. You would benefit from an in-person consultation. Post inflammatory hyperpigmentation is most commonly treated with bleaching creams, chemical peels, micro-needling, IPL and fractionated erbium laser. Red scars are usually treated by vascular laser or IPL. Saucer shaped scars can be treated by subcision with PRP, IPL, infini as well as fractionated erbium and CO2 lasers. Find a scar expert. Ask to see photos.