CO2 laser treatment is a skin resurfacing procedure that uses concentrated beams of carbon dioxide light to remove thin layers of damaged skin. It’s one of the most powerful laser treatments available for reducing wrinkles, scars, and sun damage, and it works by triggering your body’s natural wound-healing response to rebuild fresher, tighter skin from below. The tradeoff for those results is real downtime: most people need one to two weeks before their skin heals enough to return to normal routines.
How CO2 Lasers Resurface Skin
The laser emits a beam of infrared light that’s strongly absorbed by water in your skin cells. When that energy hits the surface, it vaporizes the outermost layers almost instantly while delivering controlled heat to the tissue underneath. That combination does two things at once: it removes damaged skin on top and triggers a deep repair process below.
Within days of treatment, your body starts producing new collagen, elastin, and hyaluronic acid in the treated area. This rebuilding process continues for about three months, at which point your skin enters what’s called a remodeling phase, where those new structural proteins organize and strengthen. The result is skin that looks smoother and feels firmer long after the surface has healed. This collagen stimulation is the reason CO2 laser results tend to be long-lasting compared to gentler, non-ablative treatments.
Fractional vs. Fully Ablative
Modern CO2 lasers come in two main modes. Fully ablative treatment removes entire sheets of skin across the treated area. It produces the most dramatic results but carries more risk and a longer recovery. Most practitioners today use the fractional approach instead, which delivers the laser in thousands of tiny columns separated by untouched skin. Those islands of healthy tissue act as a scaffolding that speeds healing considerably.
Fractional CO2 is the version most people receive for cosmetic concerns. It still delivers significant results, particularly for acne scarring, where clinical studies have shown improvement in the range of 50 to 80 percent. But because less tissue is damaged per session, some patients need more than one treatment spaced weeks or months apart to reach their goals.
What the Procedure Feels Like
Before the laser touches your skin, the treatment area is numbed. Most clinics apply a topical numbing cream and let it sit for 30 to 60 minutes. For larger areas like the full face, some practitioners also use local injections or nerve blocks to deepen pain control. During the procedure itself, you’ll likely feel heat and a prickling or stinging sensation, but the numbing keeps it manageable for most people. A full-face treatment typically takes 15 to 45 minutes depending on the settings used.
Immediately afterward, your skin will feel hot and tight, similar to a sunburn. Many clinics apply a thick layer of healing ointment and sometimes a light dressing before sending you home.
Recovery Week by Week
The first two or three days are the most uncomfortable. Your skin will be red, swollen, and may ooze or weep. Some people describe a raw, stinging feeling during this window. By about day three or four, a dark crust begins forming over the treated area. This is normal and part of the healing process.
That crust gradually lifts and peels away over the next one to two weeks as fresh skin grows underneath. During this time, you’ll need to keep the area clean and moisturized. A common aftercare method involves gentle cleansing with dilute vinegar soaks (one tablespoon of white vinegar mixed into a cup of water), followed by a layer of healing ointment and a nonstick bandage. Your provider will give you a specific schedule for this routine.
For the full one to two week healing window, you should avoid swimming pools, hot tubs, saunas, and shaving over the treated area. Once the crust has fallen off and new skin is in place, you’ll still have significant redness that can last several weeks to a few months depending on your skin tone and the intensity of treatment. Makeup can usually cover this once the surface has fully closed. The final results, driven by that ongoing collagen remodeling, continue improving for roughly three months after the procedure.
Common Side Effects and Risks
Redness is universal and expected. In lighter skin tones it can persist for weeks. Swelling, especially around the eyes, is common in the first few days. Mild itching as the skin heals is also typical.
Serious complications are uncommon. In one study of over 500 fractional CO2 laser sessions performed on burn scars, the adverse event rate was just 1.68 percent. The most frequent issue was increased pain (under 1 percent of sessions), followed by temporary scar discoloration in about 0.4 percent of cases. Infection is possible but rare when aftercare instructions are followed carefully.
Small white bumps called milia can appear during healing as new skin traps dead cells or product underneath. These are usually temporary and can be treated easily if they don’t resolve on their own.
Skin Tone and Pigmentation Risk
CO2 laser treatment carries a higher risk of pigmentation changes for people with medium to dark skin tones (sometimes classified as Fitzpatrick skin types IV through VI). In darker skin, the cells that produce pigment are naturally more reactive. When stimulated by the heat and inflammation of laser treatment, they can overproduce melanin, leaving behind dark patches known as post-inflammatory hyperpigmentation. This discoloration usually fades over time, but it can take months.
Permanent pigment changes are uncommon when conservative treatment settings are used. For darker skin tones, experienced practitioners reduce the laser’s energy and density, perform fewer passes over the skin, and space sessions further apart to minimize the thermal load. Pre-treatment preparation often includes topical products that help stabilize pigment-producing cells in the weeks leading up to the procedure. Strict sun protection before and after treatment is essential for all skin tones, but it’s especially critical for anyone at higher risk of pigmentation issues.
What CO2 Laser Treats
The most common reasons people seek CO2 laser resurfacing include:
- Acne scars: Particularly the depressed, pitted type (atrophic scars) that don’t respond well to topical treatments. CO2 laser is considered one of the most effective options for moderate to severe scarring.
- Fine lines and wrinkles: Especially around the mouth, eyes, and forehead, where collagen loss creates visible creasing.
- Sun damage and age spots: The laser removes the damaged outer layer and the collagen response evens out tone and texture.
- Uneven skin texture: Roughness, enlarged pores, and general dullness from years of cumulative damage.
- Surgical or traumatic scars: Including burn scars, where fractional CO2 has shown measurable improvements in both appearance and flexibility of the scarred tissue.
What to Expect for Cost and Sessions
A single session of fractional CO2 laser resurfacing typically costs between $1,000 and $5,000, depending on the size of the treatment area, the provider’s experience, and geographic location. It is almost never covered by insurance when performed for cosmetic reasons, though some burn scar or post-surgical scar treatments may qualify for coverage.
Many people see meaningful results after a single session, especially for wrinkles and sun damage. Deeper acne scars or extensive scarring often benefit from two to three sessions spaced several months apart to allow full healing and collagen maturation between treatments. Your provider will typically assess your results at the three-month mark before recommending additional sessions.