Hyperpigmentation around keloid scar after treatment - is there anything I can do about it? (Photo)

Hello, I had my CO2 Laser treatment for my keloids scars on my shoulder and chest some time ago and now I have a dark area around it exactly where the laser hit my skin. The treated scars where covered all the time during recovery and I never stepped directly into sunlight. The treatment did not help at all, and now because of the darkening it looks much bigger and even worse. Is there anything I can do about it?