Laser for Acne Scars in Malaysia: A Dermatologist's Guide to Fractional CO₂ Laser

Does laser work for acne scars?

Here is the honest, clinical summary before the detail:

• Fractional CO₂ improves selected atrophic acne scars through fractional resurfacing and collagen remodelling.
• Results depend strongly on scar type and depth — a shallow boxcar scar and a deep ice-pick scar do not behave the same way.
• It reduces the appearance of scars; it does not literally remove scar tissue.
• Deep ice-pick scars and strongly tethered rolling scars often need additional or combination procedures (for example TCA CROSS or subcision).
• In Asian and darker skin, careful patient selection, conservative parameters and diligent aftercare are essential to reduce the risk of post-inflammatory hyperpigmentation (PIH).

What is fractional CO₂ laser?

Fractional CO₂ laser is an ablative fractional resurfacing treatment. Two words do most of the work in that sentence — “ablative” and “fractional” — so it helps to understand both.

Ablative means the laser removes (vaporises) very thin, precise columns of skin tissue, rather than only heating it from underneath. The carbon dioxide laser's wavelength (10,600 nm) is strongly absorbed by water in the skin, which is what allows it to resurface tissue in a controlled way. Ablative lasers generally produce stronger resurfacing — and more downtime — than non-ablative lasers, which heat the deeper skin while leaving the surface intact.

Fractional means the laser energy is delivered as a grid of thousands of tiny microscopic beams rather than as one continuous sheet. Each beam creates a narrow microthermal treatment zone (MTZ) — a column of controlled injury — while the skin immediately around each column is left untouched. That surrounding healthy tissue acts as a reservoir of cells that speeds healing, which is why fractional resurfacing is safer and recovers faster than the older, fully-ablative “full-field” CO₂ resurfacing of the past.

At our clinic we use an Edge Fractional CO₂ laser, a current-generation fractional CO₂ system. Newer fractional CO₂ platforms are designed to produce very fine treatment columns, which can help reduce the intensity and duration of redness and crusting compared with older CO₂ lasers. The underlying principle, however, is the same across quality fractional CO₂ devices: controlled fractional injury that stimulates the skin's own repair and remodelling.

How does fractional CO₂ improve acne scars?

Atrophic acne scars are, in simple terms, areas where the skin lost collagen during acne healing and became depressed. Fractional CO₂ laser works by prompting the skin to rebuild in those areas. The mechanism, step by step:

1. Controlled micro-injury. The fractional laser creates thousands of microscopic columns of thermal injury (MTZs) into the epidermis and dermis, surrounded by untouched skin.
2. Wound-healing response. Each column triggers the skin's natural wound-healing cascade — clearing damaged tissue and recruiting repair cells.
3. Fibroblast activity & matrix remodelling. Fibroblasts become active and reorganise the dermal extracellular matrix around the scar.
4. New collagen formation. Over the following weeks, new collagen is laid down and the tissue remodels, which can gradually lift and soften depressed scars.
5. Progressive textural improvement. Across the healing and remodelling period, the surface irregularity of selected atrophic scars can become less pronounced.

This is why the honest language is improve, soften, remodel, reduce the appearance — not erase, cure or permanently remove. Collagen remodelling is a biological process that unfolds over weeks to months; it is a genuine change in the skin, but it is a gradual improvement of scarred tissue rather than a deletion of it.

Not all acne scars are the same

This is the single most important section on the page. “Acne scars” is not one diagnosis — it is a family of different scar shapes that behave very differently and respond to very different treatments. Getting this classification right is what separates a good result from a disappointing one.

Most acne scars fall into three atrophic (depressed) patterns, plus a separate raised category. Dermatology literature commonly describes them like this:

Rolling scars

Rolling scars are the widest — often up to about 4–5 mm across — with sloping, indistinct edges that give the skin an undulating, “rolling” appearance. Their defining feature is tethering: fibrous bands anchor the skin surface down to the deeper tissue, casting a shadow that reads as a dip.

Fractional CO₂ can improve the surface texture of rolling scars, but resurfacing alone may not fully release the deeper tethering that causes the depression. In selected tethered rolling scars, subcision — a technique that releases those fibrous bands from underneath — may be considered, often in combination with resurfacing rather than instead of it.

Boxcar scars

Boxcar scars are round-to-oval depressions, roughly 1.5–4 mm wide, with sharply defined vertical walls — like a small crater with a flat base. They are usually divided into:

• Superficial boxcar (shallower): often responds well to fractional resurfacing.
• Deep boxcar (steeper, deeper walls): may improve with resurfacing but frequently benefits from a combination approach.

This is where fractional CO₂ tends to perform at its best. The controlled resurfacing can soften the sharp edges and stimulate collagen at the base, making the crater shallower and less shadowed over time.

Ice-pick scars

Ice-pick scars are narrow (typically under 2 mm), deep and V-shaped, tapering to a fine point deep in the dermis — like a puncture. Because they are so deep and focal, they are notoriously resistant to surface resurfacing. Fractional CO₂ across the surface often cannot reach the base of a true ice-pick scar.

For many ice-pick scars, a more targeted technique such as TCA CROSS (chemical reconstruction of skin scars, in which a high-strength acid is applied precisely to the scar base to stimulate collagen from within) is frequently more appropriate — sometimes alongside fractional CO₂ used to refine the surrounding texture.

Hypertrophic (raised) acne scars

Not all acne scars are depressed. Hypertrophic and keloidal scars are raised — the opposite problem — caused by excess collagen. It is important to distinguish these clearly, because fractional CO₂ resurfacing is not automatically the right treatment for raised scars, and some ablative approaches on keloid-prone skin need particular caution. Raised acne scars are usually managed through a different pathway.

Which acne scars respond best to CO₂ laser?

No responsible clinician can promise a fixed outcome, because response depends on depth, tethering, skin type and treatment parameters. But as a general clinical guide:

This table describes general tendencies, not guarantees. Your own result depends on assessment findings and the settings chosen for your skin.

CO₂ laser vs Pico laser for acne scars

Patients often use “acne scars” to describe two quite different things:

• Textural scars — actual depressions in the skin (boxcar, rolling, ice-pick). These are a collagen problem, and this is fractional CO₂'s territory.
• Acne marks / post-acne pigmentation — flat brown or red marks left after a spot heals, with no change in skin texture. These are a pigment problem, and this is where Pico laser is often the more relevant tool.

Many people have both — genuine depressed scars and leftover pigmentation. In those cases the two treatments are complementary rather than competing, and the sequence and timing are decided at consultation. If your main concern is uneven pigmentation, dark marks or dullness with only mild texture change, our dermatologist guide to Pico laser explains that pathway in depth.

What about RF microneedling?

RF (radiofrequency) microneedling is another way to remodel acne scars. It delivers radiofrequency energy into the dermis through fine needles, stimulating collagen with a different injury profile from a laser — and often with less surface downtime, which can matter for some patients and some skin types. It is not, however, simply a like-for-like replacement for every resurfacing treatment; the two work differently and suit different situations.

Because RF microneedling deserves proper explanation in its own right, we keep it on a dedicated page rather than duplicating it here.

Read our detailed guide to Sylfirm X RF Microneedling →

CO₂ laser for Asian skin & the PIH question

This is where experience with Malaysian and Asian skin genuinely changes the treatment. The honest position is not “CO₂ laser is completely safe for Asian skin” — it is that fractional CO₂ can be used successfully in Asian skin, but only with careful patient selection, appropriate settings and meticulous aftercare to reduce the risk of post-inflammatory hyperpigmentation (PIH).

Most Malaysian patients fall around Fitzpatrick skin types III–V. In these skin types, any inflammatory or ablative procedure carries a higher tendency for the skin to respond with temporary darkening (PIH) as it heals. This is the central safety consideration for CO₂ laser in our population — and it is very manageable, but it must be respected.

What the evidence actually shows

Published PIH rates after fractional CO₂ for acne scars vary widely between studies — which itself is the honest headline. Reported figures range from the low single digits in some series to the large majority of patients experiencing at least mild, temporary pigmentation in others. For example, across the literature on fractional resurfacing in darker skin, one CO₂ series reported PIH in roughly half of patients at one month with a much smaller proportion of residual pigmentation by six months, while another reported mild PIH in the great majority of participants; by contrast, fractional erbium and non-ablative devices have reported considerably lower rates in some studies.

The reason the numbers scatter so much is that PIH risk is not a fixed property of “CO₂ laser.” It depends on skin type, treatment density and energy, pre-treatment preparation, sun exposure and aftercare. That is precisely why parameters and patient selection matter more than the machine name. (Reported rates here are drawn from the dermatology literature and are given as ranges, not as a prediction for any individual patient — see references.)

How we lower the risk in practice

• Patient selection first — assessing skin type, pigmentation tendency and whether acne is currently controlled before recommending CO₂.
• Conservative, individualised settings — choosing density and energy appropriate to the skin type rather than the most aggressive possible pass.
• Skin preparation where appropriate — a pre-treatment regimen (for example a suitable pigment-controlling topical) may be advised for selected patients in the weeks before treatment.
• Strict sun protection — broad-spectrum sunscreen and sun avoidance before and after treatment, which is non-negotiable in the Malaysian climate.
• Structured aftercare — a clear post-treatment skincare and healing plan, with follow-up to catch and treat any early pigmentation promptly.

What happens during CO₂ laser treatment?

Understanding the journey removes most of the anxiety. A typical fractional CO₂ appointment for acne scars follows this shape:

1. Consultation & scar assessment. Before anything else, your scar types, depth, tethering, pigmentation and current acne status are assessed, and the plan is agreed.
2. Skin preparation. If appropriate for your skin, a preparatory regimen may have been started in the weeks beforehand.
3. Cleansing. The treatment area is thoroughly cleansed.
4. Topical anaesthesia. A numbing cream is usually applied and left for a period beforehand so the treatment is comfortable.
5. Laser treatment. The fractional CO₂ laser is passed over the treatment area; the active laser time itself is generally short.
6. Cooling & soothing. The skin is cooled and soothed immediately afterwards.
7. Aftercare instructions. You are given a clear post-treatment plan for cleansing, moisturising, sun protection and what to expect while healing.

Exact numbing times and laser settings are decided individually and are not one-size-fits-all; your clinician will confirm the specifics for your treatment.

CO₂ laser recovery & downtime

What most patients notice, in sequence:

• First hours to day one: warmth, redness and a sunburn-like sensation; some swelling, especially if larger areas are treated.
• Following days: the skin may feel rough and dry and go through light peeling or fine crusting as the treated columns heal. Newer fine-beam fractional CO₂ is designed to keep this milder and shorter than older CO₂ lasers.
• After the surface settles: a period of pinkness can remain, which fades over time and is easily covered once the skin has healed.

Because healing genuinely differs between people and between settings, we avoid quoting a single fixed “X days of downtime” for everyone. At your consultation we give you a realistic recovery window for your planned treatment and skin, and practical guidance on timing it around work or events.

How many CO₂ laser sessions are needed?

Two people with “acne scars” can need quite different plans: a person with mild, mostly superficial texture may need relatively few sessions, while someone with deeper or mixed scarring may need a longer, staged course — sometimes alongside other techniques such as subcision or TCA CROSS for the scars that laser alone will not fully address.

Sessions are spaced apart to allow the skin to heal and collagen to remodel between treatments. Rather than promising a guaranteed number, we set out an expected range for your situation at consultation and reassess as your skin responds — because the right plan is the one that matches your scars, not a fixed package.

When will I see results?

Improvement from fractional CO₂ arrives in phases, and patience is part of the treatment:

• Early changes: once the initial redness and peeling settle, the skin often looks smoother and brighter as the surface renews.
• Healing phase: over the following weeks the treated skin continues to repair and even out.
• Collagen remodelling: the deeper improvement in scar depth comes from new collagen, which is laid down and remodelled over weeks to months — so scars typically continue to soften gradually after the surface has healed.
• Cumulative improvement: across a planned course, results build session on session.

This is why realistic expectations matter. Fractional CO₂ is not an “instant results” treatment; its main benefit is a progressive improvement in texture and scar depth that develops over time as collagen remodels.

Can CO₂ laser completely remove acne scars?

The degree of improvement depends on scar type, depth, your skin's characteristics, the treatment parameters and whether additional procedures are combined with the laser. A shallow boxcar scar may improve a great deal; a deep ice-pick scar treated with laser alone may change relatively little. Being clear about this up front is part of doing the treatment properly — and it is why our consultation focuses on what is realistically achievable for your scars.

When CO₂ laser may not be the best choice

Recommending against a treatment when it is not right is as important as offering it. Fractional CO₂ may not be the best first choice when:

• Scars are mainly deep ice-pick — where a targeted technique such as TCA CROSS is often more effective than surface resurfacing.
• Rolling scars are strongly tethered — where subcision to release the bands may be needed before, or instead of, relying on resurfacing.
• Acne is still active and inflamed — treating scars while acne is uncontrolled is usually premature; settling the acne comes first.
• There is significant uncontrolled pigmentation — which may need to be stabilised before adding an ablative treatment that can itself provoke pigmentation.
• Expectations are for complete removal — if the goal is perfectly scar-free skin, no laser can honestly deliver that.
• Aftercare cannot be followed — for example strict sun protection is not realistic for the person right now, which raises PIH risk.
• The skin or scar type makes ablative resurfacing inadvisable — including certain raised-scar or keloid-prone situations.

In these situations the answer is not “no treatment” — it is usually a different or combined approach. That might mean TCA CROSS, subcision, RF microneedling, pigment-focused treatment such as Pico laser, or first getting active acne under control — matched to what your skin actually needs.

Risks & side effects of CO₂ laser

Fractional CO₂ is a well-established treatment, but like any real medical procedure it has risks. Being open about them is part of informed consent. Possible side effects include:

• Redness and swelling — expected in the early healing period; usually settles.
• Prolonged erythema — redness that lasts longer than usual in some people.
• Post-inflammatory hyperpigmentation (PIH) — temporary darkening, the main consideration in Asian and darker skin (see above).
• Hypopigmentation — lightening of the skin, which is less common but can be longer-lasting.
• Infection — uncommon with proper aftercare, but possible any time the skin barrier is treated.
• Acne or milia flare — a temporary breakout or small bumps during healing in some patients.
• Prolonged healing — slower recovery in some individuals.
• Scarring — uncommon, but a recognised risk with any ablative resurfacing.

The likelihood of these depends heavily on patient factors and treatment parameters — which is exactly why assessment, appropriate settings and good aftercare matter. We will not tell you a procedure is “100% safe” or “zero risk,” because that is not true of any real treatment; we will tell you the actual risks and how we work to minimise them for your skin.

CO₂ laser before & after

These are real patients treated at Loh & Celine Skin Specialist Clinic. Results vary from person to person depending on scar type, skin and the plan followed — the images below are examples, not a promise of the same outcome for everyone.

Before/after disclaimer: Photographs show individual results and are not a guarantee of outcome. Results depend on scar type, skin type, number of sessions and adherence to aftercare. Images are unretouched and taken under consistent conditions where possible.

Dr Celine's approach: I assess the scar first, not the laser

When someone comes in asking for “CO₂ laser for acne scars,” my first job is not to book the laser — it is to understand the scars. Two faces that both look “scarred” can need completely different plans, and choosing a machine before understanding the scar is how patients end up disappointed.

So a consultation with me is really a scar assessment. I look at:

• Scar morphology — are these boxcar, rolling, ice-pick, mixed, or actually flat pigment marks rather than true scars?
• Depth and tethering — how deep are they, and are any rolling scars anchored down by fibrous bands?
• Pigmentation — is there post-acne pigmentation that needs its own plan, and what is the PIH risk for this skin?
• Active acne — is acne still inflamed? If so, we settle that before resurfacing.
• Skin type — Fitzpatrick type guides how conservative the settings need to be.
• Downtime tolerance — what recovery is realistic for this person's life and schedule.
• Previous procedures — what has already been tried, and how the skin responded.
• Expectations — what “better” means to this patient, and whether it is achievable.

Only after that do I decide whether fractional CO₂ is the right tool — and for many patients with atrophic, textural scarring, it is an excellent one. For others, the honest answer is that CO₂ should be combined with TCA CROSS or subcision, or that a pigment-focused or RF-microneedling approach fits better, or that we should treat their acne first. That reasoning — matching the treatment to the scar rather than the scar to a machine — is the whole point.

CO₂ laser vs other acne scar options at a glance

Fractional CO₂ is the hero treatment for atrophic textural scarring, but it sits within a small toolkit. Here is how the main options compare — and why they are often used together rather than in isolation:

This is a decision aid, not a substitute for assessment. Most real plans combine two or more of these, sequenced to the individual.

Written & medically reviewed by our dermatology team

This guide reflects how acne scars are actually assessed and treated at our clinic, and is written and reviewed by our doctors rather than by an agency.

Written by

Dr Celine Tan

M.B.B.S (Malaya)

Diploma in Dermatology (Cardiff)

Diploma in Dermatology (Thailand)

Diploma in Aesthetic Medicine (USA)

LCP-Certified (MOH)

Medically reviewed by

Dr Loh Ken Chen

Consultant Dermatologist

MBBS (Malaya)

MRCP (UK)

Advanced Master of Dermatology (UKM)

NSR 133112

Serving patients from Alor Setar and across Kedah, as well as Sungai Petani, Penang, Perlis and northern Malaysia.

Related reading

References & further reading

1. Liu et al. Efficacy and safety of CO₂ fractional laser versus Er:YAG fractional laser in the treatment of atrophic acne scar: a meta-analysis and systematic review. J Cosmet Dermatol. 2024.
2. Fractional CO₂ laser for atrophic acne scars and related clinical factors: a retrospective study of 121 patients. 2022.
3. Acne Scarring — Pathogenesis, Evaluation, and Treatment Options. J Clin Aesthet Dermatol (JCAD). 2017. (Scar classification: ice-pick 60–70%, boxcar 20–30%, rolling 15–25%.)
4. Evidence-based management of cutaneous scarring in dermatology, part 2: atrophic acne scarring. Arch Dermatol Res. 2023/2024.
5. Fractional lasers for acne scarring in patients with skin of color — reported PIH rates and parameter guidance (Fitzpatrick IV–VI). Review, 2017.
6. Khunger et al. Evaluation of the CROSS technique with 100% TCA in the management of ice-pick acne scars in darker skin types. J Cosmet Dermatol. 2011.
7. DermNet: TCA CROSS for acne scars.