A fractional laser is a device that delivers thousands of tiny, evenly spaced beams of light into the skin, creating microscopic columns of treated tissue while leaving the surrounding skin completely untouched. This “fractional” approach, where only a fraction of the skin surface is directly affected, triggers the body’s natural wound-healing response and collagen production while allowing much faster recovery than older lasers that treated the entire surface at once.
The technique has become one of the most widely used tools in cosmetic dermatology for treating wrinkles, acne scars, sun damage, and uneven skin tone. Understanding how it works, what recovery looks like, and what results to expect can help you figure out whether it’s the right option for your skin concern.
How Fractional Lasers Work
Traditional laser resurfacing removes or heats the entire surface of the treated area. Fractional lasers work differently. They create thousands of microscopic columns of injury called microthermal treatment zones. Each column is essentially a tiny dot of heat delivered deep into the skin, surrounded on all sides by healthy, untreated tissue. Think of it like aerating a lawn: small holes are punched in a pattern, but most of the surface stays intact.
This pattern of controlled damage triggers two key responses. First, the body starts rapidly repairing the tiny wounds, using the surrounding healthy tissue as a scaffold to heal from. Second, the heat stimulates the formation of new collagen in the deeper layers of skin, which gradually firms and smooths the treated area over the following weeks and months. Because so much healthy tissue remains between each treatment zone, healing is dramatically faster than with full-surface resurfacing, where the entire outer layer of skin is removed at once.
Ablative vs. Non-Ablative Types
Fractional lasers fall into two broad categories, and the difference between them is significant for both results and recovery.
Ablative fractional lasers vaporize small columns of skin tissue, physically removing it. These are the more aggressive option and produce more dramatic improvements. The most common types use carbon dioxide (CO2) or erbium wavelengths. Recovery from a fractional CO2 treatment typically takes 4 to 10 days before you can return to work, while fractional erbium lasers require only 1 to 3 days off. Crusting forms over the treated spots and gradually falls away over the first one to two weeks. Redness can persist for several weeks after a fractional CO2 session.
Non-ablative fractional lasers heat columns of tissue beneath the skin without breaking the surface. The outer layer of skin stays intact, which means less downtime and a lower risk of complications. Results are more subtle, though, and you’ll typically need more sessions to achieve a similar degree of improvement. These are often better suited for mild to moderate concerns like early fine lines, light sun damage, or minor texture irregularities.
What It Treats
Fractional ablative CO2 lasers are now considered the gold standard for nonsurgical skin rejuvenation. They improve skin texture, tightness, and tone while reducing visible signs of aging. The most common reasons people seek fractional laser treatment include:
- Acne scars: One of the most effective non-surgical options, though deep scars may need 4 to 6 sessions.
- Fine lines and wrinkles: Moderate to advanced wrinkling with some sun-related discoloration responds particularly well.
- Sun damage and uneven pigmentation: Hyperpigmentation sometimes improves in as few as 1 to 2 sessions.
- Skin laxity: Fractional lasers can tighten mildly loose skin on both the face and body, including the neck and eyelids.
- Overall texture and tone: Rough, dull, or uneven skin sees noticeable smoothing as new collagen develops.
What the Procedure Feels Like
A numbing cream is applied to the treatment area, usually about an hour or two before the procedure begins. For fractional treatments, topical numbing combined with cold-air cooling during the session is enough for most people to stay comfortable. The sensation is often described as a prickling heat or the snapping of a rubber band repeated rapidly across the skin. Full facial sessions with deeper ablative settings sometimes use light sedation, though most patients are discharged within 60 minutes and the vast majority don’t need pain medication afterward.
The actual laser portion of the appointment is relatively quick. Depending on the size of the area being treated and the device settings, the laser itself takes anywhere from 15 to 45 minutes. Including numbing time, expect the full appointment to run about 90 minutes to two hours.
Recovery and Healing Timeline
Recovery depends heavily on whether you’re getting an ablative or non-ablative treatment, and at what intensity. For a fractional CO2 treatment, one of the more common ablative options, here’s what to expect:
During the first two to three days, expect swelling, redness, and a sunburn-like sensation. Ice packs wrapped in a soft cloth help with discomfort. The skin will start to form small crusts or flakes over the treated spots. You’ll need to keep the area clean and moist, gently washing several times a day and applying a thin layer of petroleum jelly or the ointment your provider recommends. Do not pick at crusts or scabs.
By days three to five, crusting begins to resolve. You can resume normal daily activities but should avoid strenuous exercise that causes facial sweating. Between days five and eight, most of the flaking is finished and the skin underneath is pink and new. The treated area may look red or darkened for another week or two as healing continues beneath the surface. Full healing of the outer skin takes one to two weeks, but the deeper collagen remodeling that produces the visible tightening and smoothing continues for months.
Non-ablative fractional treatments have far less downtime. You may look flushed or mildly swollen for a day or two, with some light peeling, but many people return to their normal routine the next day.
How Many Sessions You’ll Need
Most people need 3 to 5 sessions of non-ablative fractional laser, spaced about 3 to 4 weeks apart, to see meaningful improvement in scars, fine lines, and texture. For a single ablative fractional treatment at higher intensity, one session can produce dramatic results, though some people opt for two or three sessions at lower settings to spread out recovery time.
Results develop gradually. You’ll notice improved tone and reduced pigmentation within 2 to 4 weeks. More significant changes from collagen remodeling become visible at 6 to 12 weeks. Collagen production continues building for up to 6 months after your last treatment. If you’re planning around a specific event, schedule your first session at least 4 to 6 weeks beforehand to allow the initial healing and early collagen changes to take effect.
Risks and Side Effects
The most common complication is post-inflammatory hyperpigmentation, where the treated skin temporarily darkens. This risk is highest in people with darker skin tones (Fitzpatrick types III through VI) and in anyone with a recent tan. Avoiding sun exposure for at least two weeks before treatment reduces this risk, and using a fractional delivery pattern rather than full-surface resurfacing also helps. If darkening does occur, it typically fades over time with the help of brightening creams or light chemical peels.
Infection is another concern, particularly with ablative treatments, because the skin’s protective barrier is disrupted. Herpes simplex virus (the cold sore virus) can reactivate after laser treatment around the mouth, so antiviral medication is commonly prescribed beforehand if you have a history of cold sores. Active skin infections are a reason to postpone treatment entirely.
Burns, scarring, and lightening of the skin (hypopigmentation) are less common but possible with any laser treatment. These risks increase with more aggressive settings and with inexperienced operators.
Aftercare Essentials
Proper aftercare makes a real difference in both your results and your risk of complications. For ablative fractional treatments, the core routine involves keeping the skin clean and moist. Wash your hands thoroughly, gently dab a mild cleanser onto the treated area without rubbing, rinse with diluted white vinegar (two capfuls in two liters of water), and apply a thin coat of petroleum jelly. Repeat this every two to three hours on the first day, then reduce frequency as crusting slows down over the following days.
Avoid direct sun exposure for 4 to 6 weeks after treatment to minimize the risk of pigmentation changes. Stay out of swimming pools, hot tubs, saunas, and baths for the first one to two weeks. Don’t shave over the treated area during that time either. Once healing is complete, a broad-spectrum sunscreen becomes essential for protecting your results long-term.
Cost
The average cost of a laser skin resurfacing session is $1,829, according to the American Society of Plastic Surgeons. That figure covers the procedure itself and doesn’t include related expenses like the consultation, numbing agents, aftercare products, or follow-up visits. Non-ablative sessions tend to cost less per treatment but require more sessions, so the total investment can be comparable. Prices vary widely based on geographic location, the specific device used, the size of the treated area, and the provider’s experience. Fractional laser treatments are cosmetic procedures and are not covered by insurance.