What Helps Remove Acne Scars? Treatments That Work

Several treatments meaningfully improve acne scars, but no single procedure erases them completely in one session, and which treatment works best depends on the type and depth of scar you’re dealing with. Dermatologists now have a toolbox that ranges from topical retinoids and chemical peels to lasers, microneedling, subcision, and injectable fillers. The field has evolved dramatically over the past three decades, with fractional lasers and combination protocols representing the biggest leaps forward.¹ Choosing the right approach starts with understanding what kind of scar you have.

Why Scar Type Matters More Than You Think

Acne scars fall into two broad camps: atrophic scars, which are indentations where tissue was lost, and raised scars like hypertrophic scars or keloids, where the body overproduced collagen during healing. Most people seeking treatment have atrophic scars, and dermatologists classify these into three subtypes: icepick, rolling, and boxcar.² Icepick scars are narrow, deep pits that look like they were made with a sharp instrument. Rolling scars create a wave-like undulation across the skin because fibrous bands pull the surface downward. Boxcar scars are wider depressions with sharply defined edges, almost like chickenpox marks.

These aren’t just cosmetic labels. Histological studies show that icepick scars tend to be the deepest, averaging nearly twice the depth of boxcar scars in biopsied samples, with significantly disorganized collagen and reduced elastic tissue throughout all types.³ That depth difference explains why icepick scars are the most stubborn to treat with surface-level procedures and often require targeted approaches like chemical reconstruction or punch excision.

Topical Retinoids as a Starting Point

If your scars are relatively shallow, prescription retinoids can produce real improvement without any procedures at all. Retinoids speed up skin cell turnover and boost collagen production over time, gradually smoothing the skin surface. Adapalene, tretinoin, and tazarotene have all shown efficacy for acne scars in studies. A newer retinoid called trifarotene showed particularly promising results: in a clinical trial, the trifarotene group saw roughly a 55% reduction in total atrophic scar count over 24 weeks compared to about 30% in the placebo group, with measurable differences appearing as early as two weeks.⁴

Retinoids are not going to transform deep scars, but they’re a reasonable first step for mild scarring and work well as a maintenance treatment between procedures. They also help prevent new scars from forming if you still have active acne. The main downside is that they take months to show results and can cause dryness and irritation, especially when you’re first starting.

Chemical Peels and the CROSS Technique

Chemical peels have been used for acne scars for decades, but the technique that gets the most attention for deep scars is CROSS, which stands for chemical reconstruction of skin scars. Instead of applying acid across your whole face, a dermatologist places a small amount of high-concentration trichloroacetic acid (TCA) directly into each individual scar. This causes a controlled injury that triggers new collagen formation from the bottom of the scar upward.

For icepick scars specifically, CROSS with full-strength TCA produces strong results. In one study, more than 70% improvement was observed in the majority of patients after four sessions.⁵ Similar results have been confirmed in patients with darker skin tones, where the technique produced excellent improvement in about three-quarters of patients.⁶ The technique works better on icepick scars than on boxcar scars, likely because the narrow, deep shape of icepick scars responds well to the focused collagen remodeling that CROSS triggers.⁷

CROSS is appealing because it’s inexpensive, doesn’t require specialized equipment, and has minimal downtime. You’ll have small white spots where the acid was applied for a few days, followed by scabbing that resolves in about a week. Multiple sessions spaced a few weeks apart are standard.

Microneedling

Microneedling, sometimes called collagen induction therapy, involves rolling or stamping a device covered in fine needles across the skin. The micro-injuries trigger your body’s wound-healing cascade, which ramps up production of collagen and elastin.⁸ Over multiple sessions, this remodeling gradually fills in atrophic scars.

Research consistently shows that microneedling produces visible improvement in atrophic acne scars with minimal recovery time. One study using objective measurements found a significant increase in collagen types I, III, and VII after treatment, confirming that the clinical improvements patients report are backed by real structural changes in the skin.⁹ Most people need three to six sessions spaced about four to six weeks apart. Professional microneedling uses longer needles than at-home rollers and can reach deeper into the dermis, which matters for scar treatment specifically.

Adding platelet-rich plasma (PRP) to microneedling sessions appears to boost results. In a split-face trial where one side of the face received microneedling alone and the other received microneedling plus PRP, the PRP side showed better outcomes: about 37% of patients reported more than 75% improvement on the PRP side, compared to only 3% on the microneedling-only side.¹⁰ PRP is prepared from your own blood and contains concentrated growth factors that may accelerate the healing response. That said, both sides in studies like these still show improvement, so microneedling on its own is a valid option.¹¹

Laser Treatments

Lasers represent the most studied and arguably most effective category of acne scar treatment. They come in two main flavors: ablative and non-ablative. Ablative fractional lasers (like CO₂ and erbium YAG) vaporize tiny columns of skin tissue, forcing the body to rebuild those columns with new, healthier collagen. Non-ablative fractional lasers heat the deeper layers of skin without breaking the surface, triggering collagen remodeling with less downtime.

Ablative fractional CO₂ laser has the strongest evidence for moderate to severe acne scars. A randomized controlled trial confirmed that it safely improved atrophic scars.¹² In a split-face study comparing fractional CO₂ laser on one side to microneedling on the other, the laser side showed roughly 33% improvement in scar grade compared to about 9% on the microneedling side, and patients rated their subjective improvement at nearly 50% on the laser side versus about 20% on the microneedling side. Rolling scars responded best, with about 43% improvement, followed by boxcar scars.¹³

Non-ablative fractional lasers offer a gentler alternative. A randomized trial of a 1,540-nm non-ablative laser showed that treated scars appeared smoother and more even compared to untreated control areas, with half the patients rating their scars as moderately or significantly improved. Side effects were limited to temporary redness, swelling, and crusting.¹⁴ The tradeoff is clear: ablative lasers deliver more dramatic improvement per session but involve a week or more of downtime with redness, swelling, and peeling. Non-ablative lasers have you back to normal in a day or two but require more sessions for comparable results.

Radiofrequency Microneedling

RF microneedling combines the mechanical collagen induction of standard microneedling with radiofrequency energy delivered through the needle tips. The RF energy heats the deeper dermis, creating a larger zone of tissue remodeling than needles alone would produce. This triggers a bigger release of growth factors and cytokines involved in wound healing and collagen production.¹⁵

One significant advantage of RF microneedling is safety across skin tones. Because the energy is delivered below the skin surface and the epidermis is largely spared (aside from the tiny needle punctures themselves), the risk of post-inflammatory hyperpigmentation is lower than with ablative lasers. This makes it an attractive option for people with darker skin who want more aggressive treatment than standard microneedling but are concerned about pigmentation side effects.

Subcision

Rolling scars have a specific structural problem: fibrous bands of scar tissue pull the skin surface downward, creating those wave-like depressions. Subcision directly addresses this by using a needle or small blade inserted under the skin to physically cut those tethering bands. Once released, the skin can spring back up to a more level surface, and the wound-healing response underneath produces new collagen that helps maintain the lift.

Subcision is particularly well-suited for rolling scars and works less well for icepick scars, which don’t have the same tethering mechanism.¹⁶ It’s often combined with other procedures rather than used alone. A comprehensive review found that subcision pairs well with microneedling, fillers, lasers, and other treatments to achieve better overall results than any single technique.¹⁷

Dermal Fillers

Fillers offer a different approach entirely. Instead of stimulating your body to produce new collagen over months, they physically raise the depressed scar by injecting material underneath it. A systematic review of 24 studies found that all major filler types — including hyaluronic acid, collagen-based fillers, collagen stimulators, autologous fat, and decellularized matrix fillers — produced significant scar improvement.¹⁸

Hyaluronic acid fillers provide immediate visible improvement but are temporary, typically lasting six months to a year before the body absorbs them. Collagen stimulators like poly-L-lactic acid and calcium hydroxyapatite take longer to show results but promote your own collagen growth, so the effects can last longer. Newer hybrid fillers that combine hyaluronic acid with calcium hydroxyapatite aim to provide both immediate volume and long-term collagen stimulation.¹⁹ Fillers work best on broader, shallower scars rather than narrow icepick scars, where there isn’t enough space to inject material effectively.

Why Combination Protocols Often Work Best

Since different scar types respond to different treatments, and most people have a mix of icepick, rolling, and boxcar scars on the same face, dermatologists increasingly combine multiple approaches in a single treatment plan. A protocol using CROSS for the deep icepick scars, subcision for rolling scars, and microneedling across the full area showed consistently high patient satisfaction and visible improvement.²⁰

In a study of combination therapy using subcision, CROSS, and microneedling together, all patients with moderate scars ended up scar-free, and even patients with the most severe scars improved by at least one to two grades. Patient satisfaction was high across the board.²¹ A study in patients with darker skin found that subcision plus microneedling produced improvement in over 95% of patients, with rolling and boxcar scars responding more than icepick scars.²²

The logic behind combinations is straightforward: subcision releases tethered scars, CROSS fills in deep pits from the bottom up, and microneedling or lasers improve the overall skin texture across the treated area. Each technique handles a different part of the problem.

Treating Acne Scars in Darker Skin

Skin tone significantly affects both the type of scarring that develops and the safety of treatment options. People with darker skin are more prone to post-inflammatory hyperpigmentation (PIH), where the treated area temporarily darkens after a procedure. Acne itself also tends to leave dark marks in darker skin tones, while lighter skin tones more commonly develop red marks (post-inflammatory erythema).²³

Laser treatments can still be used effectively in darker skin, but the approach needs to be modified. Non-ablative fractional lasers are generally considered the first-line laser option for acne scars in darker skin because of their better safety profile, though they are less effective per session and require more treatments than ablative lasers.²⁴ When ablative fractional lasers are used, practitioners need to be aware of the higher risk of pain and post-inflammatory hyperpigmentation.²⁵ Lower energy settings, lower density, and longer intervals between sessions can help reduce these risks. Appropriate treatment protocols make laser treatment viable even for the darkest skin tones.²⁶

Procedures like microneedling, subcision, and CROSS tend to carry lower pigmentation risk than lasers for darker skin, which is one reason combination protocols built around these non-laser techniques are popular in skin-of-color dermatology.

Raised Scars Are a Different Problem

Hypertrophic scars and keloids require an entirely different treatment strategy from atrophic scars. These raised, thickened scars result from collagen overproduction rather than loss, so treatments aimed at stimulating collagen (like microneedling or lasers) can sometimes make them worse if not carefully applied. The standard first-line treatment is intralesional corticosteroid injection, most commonly triamcinolone acetonide. Response rates vary widely, with published figures ranging from about 50 to 100% effectiveness, though recurrence is common. Corticosteroid tapes and plasters containing agents like fludroxycortide or betamethasone can also help prevent raised scars from forming after surgery.²⁷ If you’re prone to keloids, discuss this with your dermatologist before pursuing any acne scar treatment, since procedures that work well for atrophic scars could trigger keloid formation in susceptible skin.

At-Home Devices and Realistic Expectations

The consumer market for at-home skin devices has exploded, with derma rollers, LED masks, and miniaturized laser devices all marketed for acne scars. These devices generally deliver far less energy per session than professional treatments, and consumers should have realistic expectations about outcomes.²⁸ A home derma roller with 0.25-mm needles may improve product absorption and provide a mild glow, but it is not reaching the dermal depth needed to remodel scar tissue the way a professional 1.5-mm microneedling device does.

This doesn’t mean at-home care is useless for scars. Consistent daily retinoid use, sunscreen to prevent scar darkening, and gentle exfoliation with alpha-hydroxy acids can meaningfully improve the appearance of mild scarring over months. These are complementary steps that support professional treatments rather than substitutes for them. If your scars are moderate to severe, professional treatment is realistically the only path to significant visible change.

Exosomes and Other Emerging Approaches

Stem cell-derived exosomes are one of the newer arrivals in the acne scar treatment landscape. These are tiny particles released by stem cells that carry growth factors and signaling molecules capable of stimulating tissue repair. Early studies suggest they may enhance results when combined with other treatments. A randomized split-face trial found that adding adipose tissue stem cell-derived exosomes to fractional CO₂ laser treatment produced about a 33% reduction in scar scores on the treated side, compared to roughly 20% on the laser-only side.²⁹

These are promising early results, but the evidence is thin compared to established treatments like lasers and microneedling. Exosome products are not yet well regulated in most countries, and quality varies. This is a space to watch rather than rush into.

The Emotional Weight of Acne Scars

The motivation to treat acne scars goes beyond cosmetics. A large multinational study found that about a quarter of people with acne scars felt less attractive or embarrassed because of them, over a third avoided public appearances, and more than 40% felt their scars had negatively affected their relationships. About 8% reported regular verbal or physical abuse related to their scars, and roughly 16% felt they had been unfairly dismissed from work.³⁰ These numbers underscore that acne scar treatment isn’t vanity. The psychological burden is real and well-documented, and it’s a legitimate reason to pursue treatment even when the scars might seem “mild” by clinical standards. If your scars bother you, that’s reason enough to explore your options.