Acne scarring is one of the most common reasons patients walk into UK clinics and one of the most misunderstood, because “acne scarring” is rarely a single problem.
The face in front of you usually carries a mix of textural change, residual pigment and redness, each with a different cause and each responding to a different wavelength. The clinically useful question is therefore not “which laser is best for acne scars?” but “which of these problems am I treating, and in what order?”
Get that diagnosis right, and device selection follows logically. Get it wrong, and you can spend sessions resurfacing skin when the visible complaint was never scar tissue at all.
The Types of Acne Scarring (and Why It Matters for Device Choice)
The first job in any consultation is to separate true scarring from the pigmentary and vascular marks that are routinely mistaken for it.
Atrophic scars are the most common form of true acne scarring and are a result of collagen loss during healing. They are conventionally grouped into three morphologies: narrow, deep ice pick scars; sharply defined boxcar scars; and broader, undulating rolling scars tethered to the underlying tissue. Most patients have more than one type at once.
Hypertrophic and keloid scars are the opposite problem: an excess of disorganised collagen producing a raised lesion. These are less common on the face and behave very differently from atrophic scarring, so they warrant their own assessment and a cautious approach, covered separately further down in the article.
The two marks most often mislabelled as scars are not scars at all. Post-inflammatory hyperpigmentation (PIH) is excess melanin left after inflammation. Post-inflammatory erythema (PIE) is a vascular change with dilated superficial capillaries that read as persistent pink or red marks. Neither involves the textural collagen change that defines a scar, and neither responds to resurfacing the way atrophic scarring does.
The right device depends entirely on which of these you are addressing, and a realistic plan often combines more than one.
Textural and Atrophic Scarring: Fractional Ablative Resurfacing
For genuine atrophic and textural scarring, fractional ablative resurfacing remains the gold standard. The principle is controlled fractional injury: the laser creates a pattern of microscopic ablation columns through the epidermis and into the dermis, leaving surrounding tissue intact to drive rapid healing. That controlled injury triggers collagen remodelling, which is what gradually softens depressed scars and improves surface texture.
Resurfacing is the backbone of textural scar work, but it is not always a monotherapy. Deep ice pick scars often respond better to focal techniques such as TCA CROSS or punch excision, and tethered rolling scars to subcision, with fractional resurfacing layered in rather than used alone. In mixed atrophic scarring, the strongest results usually come from combining modalities, which is exactly why the diagnosis leads, and the device follows.
The erbium:YAG (Er:YAG) wavelength is well suited to this work. At 2,940 nm, it sits at the peak absorption coefficient of water, so energy is deposited precisely in tissue with minimal thermal spread to the surrounding skin. In practice, that tends to mean a more controlled ablation and shorter downtime than fully ablative carbon dioxide resurfacing, which is part of why fractional Er:YAG has become such a widely used option.
A randomised trial reported significant improvement in acne scarring with the erbium-YAG laser.
This is where the Dermablate Cool Laser fits. Its Er:YAG platform offers both fractional and fully ablative modes, with a fractional handpiece for resurfacing textural scarring and variable-spot delivery for more focused work. The honest framing for patients matters here: fractional resurfacing improves atrophic scarring over a course of treatments. It does not erase it.
Pigmentation Left Behind: Addressing PIH
When the visible complaint is brown or grey-brown marks rather than depressions, the target is melanin, not collagen, and resurfacing is the wrong first move. PIH is a reactive hypermelanosis that follows inflammation and is especially common and persistent in darker skin types.
Picosecond and Q-switched technologies are the relevant tools for the pigment component. Their very short pulse durations generate a strong photomechanical (photoacoustic) effect that fragments melanin into smaller particles for clearance, with comparatively little heat.
That lower thermal load is precisely what makes picosecond platforms a more considered choice where there is a meaningful risk of provoking further pigmentation. A systematic review of PIH in darker skin notes that picosecond lasers are regarded as safer for darker tones because they minimise unwanted heat damage.
Our PicoStar is the platform for this part of the plan. One caveat worth flagging to patients and to clinicians: ablative resurfacing can itself provoke PIH, so where pigment is part of the picture, the sequencing and timing of treatments matter as much as the device chosen.
Lingering Redness: The Vascular Component (PIE)
Persistent redness after acne is the most frequently misdiagnosed of all. PIE (Post-inflammatory Erythema) is a vascular phenomenon, with dilated capillaries and telangiectatic vessels in the superficial dermis, not scar tissue and not pigment. Because the chromophore is haemoglobin rather than water or melanin, neither resurfacing nor a pigment-targeting device is the right answer.
Vascular and yellow-wavelength lasers work on the principle of selective photothermolysis, targeting oxyhaemoglobin to coagulate the offending vessels while sparing surrounding tissue. The pulsed dye laser is widely described as the gold standard for superficial vascular lesions.
For clinics building this capability, the QuadroStar PRO Yellow system and the VascuStar DYE pulsed dye laser are the devices aimed at this vascular component. Identifying PIE correctly at consultation prevents the common error of treating redness as if it were scarring.
Raised Scars: Hypertrophic and Keloid Lesions
The raised scars set aside earlier need their own pathway. Because hypertrophic and keloid lesions are vascular as well as fibrotic, the pulsed dye laser has an established role in flattening them and reducing the associated redness. This is typically alongside first-line measures such as intralesional corticosteroids (steroid injections into the scar) rather than in place of them.
This is where the VascuStar DYE earns a second mention: the same 595 nm platform used for PIE addresses the vascular component of a raised scar. Keloids in particular remain difficult and prone to recurrence, so the honest framing (agreed at consultation) is improvement and control, not guaranteed resolution, with a conservative combination approach as the safest route.
Building a Treatment Plan
In reality, many acne-scar patients have a combination: some atrophic texture, a scatter of brown marks, and maybe a wash of residual redness. The art is in sequencing. A defensible general approach is to ensure active acne is controlled first, then address the vascular and pigmentary components, with fractional resurfacing of textural scarring planned around them rather than layered on top in a single rushed visit.
Session counts should be set honestly at the outset. Meaningful improvement in atrophic scarring often requires a course of treatments spaced several weeks apart, with results that continue to develop as collagen remodels over the following months. Pigment and vascular work follow their own schedules.
The single most useful thing a clinician can do commercially and clinically is manage expectations: the goal is a measurable, often substantial improvement, not a blank slate. Clinics offering a broader scar reduction service can position acne scarring as one defined pathway within it.
Treating Acne Scarring in Darker Skin
The risk profile shifts in higher Fitzpatrick types. Greater epidermal melanin means a higher baseline risk of post-inflammatory hyperpigmentation, and the irony of acne-scar treatment in darker skin is that an over-aggressive intervention can create the very pigment problem the patient came to resolve.
The published literature for darker skin supports conservative, considered settings, a preference for technologies that minimise thermal injury for the pigment component, and the value of test patches before committing to a full course. None of these rules out treating darker skin types; they simply demand a more cautious protocol and a practitioner trained to deliver it.
Where to Start
An effective acne-scar offering is rarely a single-device proposition. It rests on accurate diagnosis and the ability to address texture, pigment and redness with the right tool for each, supported by training that gives practitioners the confidence to combine and sequence treatments safely. Our device range, backed by clinical education through the Asclepion Academy, is built to let a clinic develop exactly that kind of multi-layered capability.
Speak to us about device selection and training to find the right combination for your clinic and your patient base. Get in touch with the team or explore the full device range.
Frequently Asked Questions
Can laser treatment remove acne scars completely?
No, and any claim that it can should be treated with scepticism. Fractional resurfacing and complementary vascular and pigment treatments can produce significant, lasting improvement in the appearance of acne scarring, but the realistic and evidence-supported goal is reduction, not complete removal. Setting that expectation clearly at the consultation protects both the patient and the clinic.
Which laser is best for acne scarring?
There is no single best laser, because “acne scarring” describes several different problems. Atrophic and textural scarring is best addressed with fractional ablative resurfacing, such as an Er:YAG platform; residual pigment (PIH) responds to picosecond or Q-switched technology; and lingering redness (PIE) requires a vascular or yellow-wavelength laser.
The best device is the one matched to the specific component you are treating, and most patients need more than one.
How many sessions does laser acne scar treatment take?
It depends on the severity and mix of scarring. Atrophic scarring generally calls for a course of treatments spaced several weeks apart, with collagen remodelling continuing to improve results over the following months. Pigment and vascular components are treated on their own schedules. A realistic plan is agreed upon at the consultation rather than fixed in advance.
Can you treat acne scars on darker skin types?
Yes. Higher Fitzpatrick skin types, however, carry a greater risk of post-inflammatory hyperpigmentation, so conservative settings, technologies that limit thermal injury, test patching and an appropriately trained practitioner are all important. The aim is to improve scarring without provoking new pigmentation.
What is the difference between acne scarring, PIH and PIE?
True acne scarring is a textural change in the skin from collagen loss (atrophic) or excess (hypertrophic). Post-inflammatory hyperpigmentation (PIH) is excess melanin, a flat brown or grey-brown mark. Post-inflammatory erythema (PIE) is a vascular change, flat pink or red marks from dilated superficial capillaries.
They look similar to patients but have different causes and require different treatments, which is why accurate diagnosis comes first.
