Yes, the CO2 laser is an ablative laser. It is considered the gold standard among ablative devices for skin resurfacing. The CO2 laser works by emitting light at a wavelength of 10,600 nanometers, which is strongly absorbed by water in skin cells. Because your skin is mostly water, the laser energy vaporizes the outer layer of skin (the epidermis) and heats the deeper layer (the dermis), triggering your body to produce new collagen as it heals.
What “Ablative” Actually Means
Ablative lasers physically remove skin tissue. They destroy the outer layer of skin in a controlled way, creating a wound that heals with fresh, smoother skin. This distinguishes them from non-ablative lasers, which heat the tissue beneath the surface without breaking or removing the skin at all.
The practical difference matters. Because ablative lasers like the CO2 laser remove skin, they produce more dramatic results, often after a single treatment. Non-ablative lasers leave the skin surface intact, which means less downtime but also milder improvements. Non-ablative treatments typically require multiple sessions to achieve noticeable changes in texture, tone, or fine lines.
Other ablative lasers exist, including erbium lasers and combination systems, but the CO2 laser penetrates deeper and generates more heat in the dermis. That deeper reach is why it remains the most effective option for treating moderate acne scars, deeper wrinkles, and significant sun damage.
Fully Ablative vs. Fractional CO2
CO2 lasers can be used in two modes, and the distinction changes the entire treatment experience. Fully ablative CO2 resurfacing removes the entire surface layer of skin in the treated area along with a measured portion of the dermis, triggering full regeneration from the ground up. Fractional ablative CO2 treats a pattern of microscopic columns while leaving bridges of untouched skin between them.
Those intact bridges of skin are what make fractional treatments heal faster and carry fewer side effects. The untouched tissue acts as a scaffold, allowing skin cells to migrate into the treated columns more quickly. Fractional CO2 is now far more common than fully ablative resurfacing for cosmetic purposes, though fully ablative treatment still has a role for severe scarring or extensive sun damage where maximum tissue remodeling is the goal.
What CO2 Lasers Treat
CO2 laser resurfacing is used for fine wrinkles, age spots, uneven skin color or texture, sun-damaged skin, and mild to moderate acne scars. It is primarily performed on the face, where the density of oil glands supports faster healing. The heat delivered to the dermis stimulates collagen production, a protein that improves skin firmness and texture, so results continue to develop for weeks to months after the procedure as new collagen forms.
The improvements from ablative CO2 resurfacing are considered permanent in the sense that the structural remodeling of the skin persists. Your skin will continue to age naturally afterward, but the reset in texture, tone, and scar depth does not reverse.
What Recovery Looks Like
Healing from CO2 laser treatment generally takes one to two weeks. In the first two to three days, the treated skin is raw and swollen. Applying ice packs for 15 to 20 minutes several times a day helps manage discomfort during this phase. Over the following days, the skin turns red or darkens, and a crust forms. That crust gradually falls away within one to two weeks.
During those first two weeks, you’ll need to avoid swimming pools, hot tubs, saunas, and shaving over the treated area. Redness can linger well beyond the initial healing window, sometimes lasting several weeks or longer depending on the depth of treatment and your skin type. Fractional CO2 treatments generally produce a shorter recovery than fully ablative sessions because less total skin surface is removed.
Pain Management During Treatment
CO2 laser resurfacing is not painless, and some form of numbing is standard. For smaller or more superficial treatments, a topical numbing cream applied under a covering for about 45 to 60 minutes before the procedure is often sufficient. For deeper or more extensive resurfacing, injectable local anesthesia is used to numb the treatment area. The approach depends on the size of the area being treated and how deep the laser will go.
Skin Tone and Risk of Darkening
The most significant risk factor for complications with CO2 lasers is skin color. Post-inflammatory hyperpigmentation, where the treated skin darkens as it heals, is the most common side effect and disproportionately affects people with darker skin tones. Up to 92% of patients with deeper complexions (Fitzpatrick skin type IV and higher) develop some degree of darkening after ablative CO2 treatment. Even among lighter-skinned patients, about 37% experience hyperpigmentation, with higher rates in those with more melanin.
Over 90% of expert dermatologists recommend adjusting laser settings for patients with medium to dark skin tones. Preventive measures include using skin-lightening agents before and after treatment and applying anti-inflammatory creams during healing, both of which have been shown to reduce the incidence of unwanted darkening. Scarring and permanent lightening of the skin are rare, occurring in less than 1% of patients, but they remain a recognized possibility with any ablative laser.
For people with darker skin, non-ablative lasers or fractional CO2 at conservative settings are often preferred over fully ablative resurfacing. Treatment parameters, number of sessions, and the interval between them should be customized based on individual skin characteristics rather than following a one-size-fits-all protocol.