The clinical approach
The idea behind laser scar work is simple to state and harder to master: you injure the skin in a controlled, patterned way so it rebuilds better than it healed the first time. Fractional lasers do this by drilling thousands of microscopic treatment zones into the tissue while leaving healthy skin untouched between each column. Those spared bridges of skin are what let recovery happen fast. Push the density too high and the columns merge, tissue sloughs, and you risk a fresh scar. Get the balance right and the surrounding skin knits the wounds closed while stimulating new collagen underneath.
Wavelength decides how the energy behaves once it lands. A 10600nm CO2 beam is drawn to water in the tissue, so it ablates the surface and drives strong thermal remodeling deeper down. That suits stubborn, textured atrophic scars where you need real resurfacing. A 1550nm mid-infrared beam is also water-absorbed but works non-ablatively, heating columns of dermis without stripping the top layer. You trade some raw power for far gentler downtime and a cleaner safety margin. The whole approach traces back to the selective photothermolysis principle Anderson and Parrish set out in 1983: match your wavelength and pulse to the target, and you concentrate heat where you want it while sparing the rest.
Treatment protocol
Scar treatment is a course, not a single visit. Plan for three to five sessions in most cases, spaced roughly four to six weeks apart so the skin has time to remodel and settle between passes. Deep or old scars may need more. Our device manuals for fractional work show operators starting conservative and layering repeated passes over multiple sessions rather than chasing everything in one aggressive sitting, and that is the sane way to build results.
Numbing matters. A topical anesthetic sits on the area for around twenty minutes before an ablative pass, and a full-face resurfacing session can run well over an hour. Afterward the skin looks sunburned and may crust for a few days with CO2 work; the 1550nm route is milder and lets people return to normal life faster. Tell patients to keep the area clean, moisturized, out of the sun, and under broad-spectrum SPF while it heals.
Caution runs highest on darker skin. Any device that dumps heat into pigmented skin can trigger post-inflammatory hyperpigmentation, so lower energy, wider spacing, and a patch test are your friends. Set honest expectations too. You are aiming for meaningful improvement in depth and texture, not erasure. No laser guarantees a scar-free result, and anyone promising one is selling a story.
Recommended equipment
Pmise builds two fractional platforms that cover the scar spectrum from opposite ends. For heavy resurfacing work, the CF-01 CO2 Fractional Laser gives you an ablative 10600nm beam with selectable spot patterns and density, which is what deep atrophic acne scars and firm surgical scars usually demand. You get more correction per session, and in return the patient accepts longer downtime and stricter aftercare.
When downtime is the deciding factor, or the patient has a higher risk of pigment trouble, reach for the EF-01 1550nm Fractional Laser. Its non-ablative mid-infrared beam remodels the dermis without stripping the surface, so recovery is quicker and the complication profile is friendlier, which makes it a comfortable choice for Asian and other darker skin types. Many clinics run both and match the tool to the scar in front of them. If your caseload leans toward acne scarring, our acne and acne scars page covers that workflow.
Frequently asked questions
Which is better for acne scars, CO2 or 1550nm?
It depends on the scar and the patient. Deep, pitted boxcar and ice-pick scars usually respond better to ablative CO2 resurfacing because it removes and rebuilds surface tissue. Shallower rolling scars, or patients who cannot afford a week of downtime, often do well on the non-ablative 1550nm laser. Plenty of clinics combine both across a treatment course.
How many sessions will a patient need?
Most scar courses run three to five sessions spaced four to six weeks apart. Old or severe scarring can take more. Improvement builds gradually between visits as new collagen forms, so patience is part of the plan. One session almost never finishes the job, and anyone told otherwise should be skeptical.
Is fractional laser safe on darker skin?
It can be, with care. Darker skin carries a real risk of post-inflammatory hyperpigmentation when too much heat lands in the epidermis. Lower energy, wider spacing, a patch test, and the gentler 1550nm platform all help cut that risk. This is trained-operator territory, and conservative parameters win.
Will treatment remove a scar completely?
No, and it helps to be straight about that. Laser resurfacing improves the depth, color, and texture of a scar, often dramatically, but it does not erase it. Realistic goals keep patients happy. Frame the outcome as significant improvement and let the results speak.