CO2 Fractional Laser

How it works

An ablative CO2 laser (10,600 nm) is absorbed by water in tissue. In fractional mode, it vaporizes thousands of microscopic columns of skin, leaving untouched tissue between them so healing is faster than with older full-surface lasers. The heat around each column tightens collagen, and the wound-healing response over the following weeks and months builds new collagen and smooths the surface. Depth and density are set by the doctor, and the more aggressive the setting, the greater the effect and the recovery. Results vary by person.

Who it may suit

• Atrophic acne scars such as boxcar and shallow rolling types
• Deeper fine lines and sun-damaged, rough texture
• Enlarged-looking pores with textural change
• People who can accept visible recovery for a stronger effect

The treatment day

1. Plan the depth. The doctor chooses depth and density based on scar type, skin tone, and how much downtime you can accept.
2. Numb thoroughly. Numbing cream is applied for a period before treatment; extra anesthetic may be used.
3. Deliver the laser. The fractional beam is passed over the area in one or more passes, producing a warm, pricking sensation.
4. Dress and instruct. A healing ointment is applied, and wound-care and sun rules are explained.

Aftercare

• Expect redness, swelling and a rough, crusted surface for about a week; the skin may feel tight or sandpapery.
• Keep the skin moist with the ointment recommended and do not pick at crusts.
• Use strict sun protection for weeks to months to reduce pigment changes.
• Call the doctor for increasing pain, pus, fever, blisters or a rash of small blisters that could signal viral reactivation.

Things to know first

• Common effects are redness lasting weeks, swelling, oozing and crusting; some people stay pink for longer.
• Risks include infection, cold sore reactivation, post-inflammatory darkening, lighter patches and, uncommonly, scarring or textural changes.
• Darker skin tones have a higher risk of pigment change and may need conservative settings or another route.
• Recent isotretinoin use, active infection, keloid tendency, pregnancy and a fresh tan call for a doctor's review.
• Deep ice pick scars and tethered rolling scars may need other techniques in addition.

How CO2 fractional compares with nearby options

The central comparison is with erbium and non-ablative fractional lasers. CO2 heats and tightens as it vaporizes, giving the strongest effect but the longest redness. Erbium removes tissue more cleanly with less heat, so recovery is often shorter and the effect somewhat less. Non-ablative fractional lasers leave the surface intact, so there is little or no crusting, but they need more sessions for a smaller change.

Against microneedle RF and microneedling, CO2 changes the surface directly, while needles work more from inside with less visible surface injury. For people who cannot take a week of recovery, microneedle RF is the usual middle option, and for depressed scars with fibrous bands, subcision is often added. For narrow ice pick scars, focal TCA treatment is considered.

CO2 resurfacing does not lift sagging and does not fix pigment such as melasma, which can worsen with heat. A doctor can weigh scar type and skin tone to see whether the stronger option is worth the recovery.