Acne Scar Treatment

Key Takeaways

An acne scar is a lasting structural change in the skin that can remain after inflammation from acne has healed. Most facial acne scars are atrophic, meaning the skin has lost or altered supporting tissue and leaves a depression. Hypertrophic scars and keloids are raised because excess scar tissue has formed.[4][8]

A second distinction is between a true scar and a flat mark. Red or pink areas may represent post-inflammatory erythema, while brown or grey-brown areas may represent post-inflammatory hyperpigmentation. These marks can improve over time and may require a different strategy from a scar that changes the contour of the skin.[1][4]

Active acne also matters. If new breakouts continue, they can create new scars while older scars are being treated. The American Academy of Dermatology recommends addressing active acne as part of the overall treatment plan.[1]

Ice-Pick Scars

These are narrow, deep depressions that can extend further into the skin than they are wide. Because their geometry is focal, broad resurfacing alone may not fully address the depth. A clinician may consider a focal technique for selected scars.

Boxcar Scars

Boxcar scars are wider depressions with relatively distinct edges. They can be shallow or deep. Resurfacing or needling approaches may help selected scars, while deeper or sharply defined scars may need a more targeted or combined plan.[4][8]

Rolling Scars

Rolling scars are broad depressions with sloping edges. Some are influenced by fibrous bands that tether the skin to deeper tissue. When tethering is a major component, a lifting procedure such as subcision may be considered alongside resurfacing or another treatment.[4][8]

Raised Scars and Mixed Problems

Hypertrophic scars and keloids follow a different treatment pathway from depressed scars and may require injections, laser treatment, cryotherapy, surgery or combinations depending on the diagnosis. Many patients also have mixed scar types plus redness or pigmentation, which is why one treatment may not address every visible concern.[1][4]

Several procedures can improve the appearance of atrophic acne scars. They are not interchangeable, and the evidence for a treatment category should not automatically be treated as proof that every device or protocol within that category works equally well. The most appropriate approach depends on scar morphology, skin characteristics, treatment intensity and clinical experience.[1][9][12]

Fractional CO₂ Laser

Fractional CO₂ is an ablative resurfacing treatment. It creates microscopic columns of controlled thermal injury while leaving surrounding skin available for healing. The resulting wound-healing response can promote collagen remodelling and improve the appearance of atrophic scars.[6][7][9]

The trade-off is treatment intensity. Fractional CO₂ can produce more visible recovery and a greater concern about pigmentary change than some less aggressive approaches. In darker skin, treatment settings and patient selection are especially important.[7][12][13]

Fractional Radiofrequency Microneedling

RF microneedling combines mechanical needling with radiofrequency energy delivered at controlled depths. This allows treatment to target the dermis while limiting some of the surface disruption associated with ablative resurfacing. Systematic reviews support RF microneedling as a useful option for atrophic acne scars, while also noting that treatment parameters and study quality vary.[10][11][12]

Medical Microneedling

Medical microneedling uses small needles to create controlled micro-injuries that stimulate collagen production during healing. The AAD describes microneedling as minimally invasive and suitable for all skin tones when properly performed. Results develop gradually and a series of treatments may be needed.[2]

Focal and Lifting Procedures

Some scars are driven by a structural problem that a surface treatment cannot fully correct. Focal techniques may be considered for selected ice-pick scars, while subcision may be considered when fibrous tethering contributes to rolling scars. These procedures can also be combined with resurfacing or needling when the scar has more than one component.[1][4][8]

PRP as an Adjunct

Platelet-rich plasma is commonly discussed as a complementary treatment. Reviews suggest that adding PRP to procedures such as microneedling or laser treatment may improve some outcomes, but protocols differ and the evidence is not uniform. It is better understood as an adjunct selected for particular treatment plans rather than a universal stand-alone solution.[1][14][15]

The table below is a clinical comparison, not a ranking. More recovery does not mean better treatment, and less recovery does not mean a treatment is more suitable. The trade-off depends on scar depth, morphology, skin type, treatment intensity and the patient's goals.[1][9][12]

What About Deep Acne Scars?

Depth alone does not determine treatment. A deep ice-pick scar, a deep rolling scar with tethering and a deep boxcar scar have different structures. The shape, edges, tethering and surrounding skin are therefore more useful for treatment planning than the word 'deep' by itself.[4][8]

Is a More Powerful Treatment Always Better?

No. Increasing treatment intensity can increase tissue injury, recovery time and pigmentary risk. The appropriate intensity is the one that offers a reasonable expected benefit for the specific scar while keeping avoidable risks acceptable. This balance is especially important in patients with darker skin or a history of post-inflammatory hyperpigmentation.[7][13][16]

A good acne-scar consultation is less about selecting a favourite device and more about answering a sequence of clinical questions. The doctor examines the scars from different angles, identifies the dominant scar patterns and separates contour problems from colour changes.

• Scar structure: Ice-pick, boxcar, rolling, raised or mixed.
• Skin type and pigmentation tendency: Especially previous post-inflammatory hyperpigmentation and how the skin responds to inflammation.
• Scar burden: Number, depth, distribution and whether active acne remains.
• Recovery needs: Work, social commitments, tolerance for redness, swelling or peeling, and the amount of aftercare required.
• Previous treatment: What has already been tried, how the skin responded and whether there were complications.
• Expectations: The degree of improvement the patient hopes to achieve and whether the goal is texture, contour, colour or a combination.

Fractional CO₂ Recovery

After ablative fractional laser treatment, redness, swelling, discomfort, crusting or peeling can occur. Recovery depends strongly on the treatment settings and the individual. Pigmentary changes, infection and prolonged redness are among the complications that need to be discussed before treatment.[3][7][13]

Microneedling and RF Microneedling Recovery

Microneedling and RF microneedling can cause temporary redness, swelling, tenderness or a rougher skin texture during healing. The exact recovery depends on needle depth, RF energy, treatment density and the patient's skin.[2][10][11]

Pigmentation Risk and Skin of Colour

Post-inflammatory hyperpigmentation is an important consideration in darker skin. It does not automatically mean that procedures should be avoided. It means treatment parameters, inflammation control, sun protection and patient selection need to be handled carefully. Reviews support the use of energy-based treatments and RF microneedling in skin of colour when appropriate settings are used, while also emphasising the need for more comparative data in darker phototypes.[12][13][16]

Aftercare Basics

• Follow the treating clinician's wound-care and skincare instructions.
• Use sun protection as directed, because ultraviolet exposure can worsen post-treatment pigmentation.
• Do not pick peeling skin or crusts.
• Report increasing pain, spreading redness, pus, fever, significant blistering or other unexpected symptoms.
• Continue acne treatment when advised, because new breakouts can create new scars.

Acne-scar improvement is usually gradual. Collagen remodelling continues after the visible surface has healed, so the final appearance can take weeks to months to become clear. Many patients need more than one treatment session, and a staged plan may be more appropriate than trying to correct every scar at once.[2][3][8]

The goal is generally to make scars less noticeable and improve skin texture or contour, not to promise complete removal. A 2026 systematic review comparing fractional CO₂ laser with needling-based approaches found broadly comparable efficacy across several measures but substantial variation between studies, while also finding a higher risk of post-inflammatory hyperpigmentation with fractional CO₂ than standard microneedling. This reinforces why patient and treatment factors matter when interpreting averages from studies.[16]

Acne scars are structural problems, not one uniform condition. Ice-pick, boxcar, rolling and raised scars can require different treatment strategies, and many patients have more than one scar pattern or a mixture of contour and colour changes. Fractional CO₂ laser, RF microneedling, medical microneedling and focal procedures all have roles in selected patients, while PRP may be useful as an adjunct.[1][4][8][12]

The most useful question is therefore not 'Which device is strongest?' It is 'Which treatment mechanism matches my scar type, skin characteristics, treatment goals and tolerance for recovery?'