Would CO2 laser help thicken skin under the eyes?

co2, plasma pen, erbium and other lasers like fraxel and halo help the under eyes.

at home peels like cosmelan, enlighten and aerify along with dermarolling (emerageskin roller with anteage MD ampules) should be started now. 

There are many things you can do to treat under eye hollows and dark circles. A surgical option to remove skin and/or fat will such as lower eyelid blepharoplasty with or without fat pad repositioning will be the best long term. There are many things you can do to treat under eye hollows and dark circles without surgery. Non invasive less downtime options such as fillers, lasers, microneedling/PRP, cosmelan peels, and microneedling RF like Fractora or morpheus can all help give some improvement. Accutite can often be used or stronger lasers like erbium or co2 spot treatment can tighten the skin and give very quick improvement in wrinkles and texture. I suggest you get a formal consultation to see what is best for you and your goals. Best, Dr. Emer.

Yes, it can definitely help if the darkening is skin-related, you need to make sure that it is also not coming from any vitamin deficiencies as well.