How to Minimize Acne Scars Based on Your Scar Type

The single most important step in minimizing acne scars is identifying what kind of scars you actually have, because treatments that work well for one type can be useless or even counterproductive for another. Acne leaves behind a surprisingly varied landscape of damage: sunken pits, broad depressions, tethered valleys, raised ridges, red patches, and dark spots. Each of these results from a different wound-healing response, and each responds to different interventions. Knowing your scar type turns a confusing menu of lasers, peels, and procedures into a much clearer treatment path.

The Main Categories of Acne Scars

Acne scars fall into two broad camps based on what happened during healing. Atrophic scars are depressions where tissue was lost. Hypertrophic and keloid scars are raised areas where the body overproduced collagen during repair. On top of these structural scars, many people also deal with color changes that are not true scars in the textural sense but are often lumped in with them: red marks (post-inflammatory erythema) and dark spots (post-inflammatory hyperpigmentation). The depth and type of inflammation that caused the original breakout plays a major role in which kind of scar forms. Scarring generally requires inflammation that reaches deep into the skin’s reticular layer, the thick lower portion of the dermis, which then triggers abnormal collagen buildup or loss.¹

Within the atrophic category, dermatologists recognize three distinct subtypes:

Ice pick scars: Narrow, deep, V-shaped pits that extend well into the dermis. They look like someone poked the skin with a sharp instrument. Histological studies show they tend to be the deepest of the three subtypes, averaging close to 2 mm deep in biopsied samples.²
Boxcar scars: Wider depressions with sharply defined vertical edges, like a shallow crater. They can be superficial or deep, but are significantly shallower on average than ice pick scars.
Rolling scars: Broad, undulating depressions that give the skin a wave-like texture. These are caused by fibrous bands pulling the skin surface down toward deeper tissue.

On the raised side, hypertrophic scars stay within the boundaries of the original wound and are most common along the jawline, upper back, and chest, areas where skin tension is high.³ Keloids, which are rarer but more challenging, grow beyond the original wound margins and involve even deeper fibrosis. Both types are driven by excessive collagen formation during healing.⁴

Treating Ice Pick Scars

Ice pick scars are the most stubborn of the atrophic types. Their narrow, deep profile means that surface-level resurfacing treatments struggle to reach the bottom of the scar. In one study testing nonablative fractional laser on all three atrophic types, ice pick scars showed only about a quarter improvement after four sessions, far less than boxcar or rolling scars.⁵ That poor response is not surprising when you consider that these scars can extend roughly 2 mm into the skin, significantly deeper than the reach of most surface treatments.²

The go-to technique for ice pick scars is the CROSS method, which stands for Chemical Reconstruction of Skin Scars. A dermatologist applies a high concentration of trichloroacetic acid (TCA) directly into the individual scar. The acid triggers a controlled inflammatory response deep within the narrow channel, which stimulates the body to lay down new collagen from the bottom up, gradually filling the depression.⁶ Multiple sessions are typically needed, spaced several weeks apart. Another option is punch excision, where the scar is literally cut out and the small wound is closed with a suture or skin graft. This trades the ice pick scar for a finer, flatter line that blends more easily with the surrounding skin.

Treating Boxcar Scars

Boxcar scars respond better to resurfacing than ice pick scars do, largely because they are wider and shallower. The same study that found poor results with fractional laser on ice pick scars reported roughly 53% improvement in boxcar scars after four sessions, a statistically significant difference.⁵ This makes fractional lasers, both ablative (like fractional CO2) and nonablative, a reasonable first-line choice for boxcar scars.

Microneedle fractional radiofrequency (MFRF) is another well-supported option. This technology uses tiny needles to deliver radiofrequency energy into the dermis, heating it enough to trigger collagen remodeling without destroying the outer skin surface.⁷ Studies using confocal microscopy to look at the skin after treatment have confirmed visible restoration of the collagen network’s structure.⁸ For shallow boxcar scars, chemical peels and even the CROSS technique can help soften the sharp edges that make the craters so visible.

Treating Rolling Scars

Rolling scars are structurally different from the other two types because the primary problem is not missing tissue at the surface but fibrous bands anchoring the skin downward. Those tethering bands pull the skin toward the underlying fat and muscle, creating a wavy, uneven texture. This makes subcision the foundational treatment. During subcision, a doctor inserts a needle or cannula under the skin to physically sever the fibrous bands, releasing the skin so it can sit at a more natural level.⁹

Subcision alone often produces visible improvement, but the results tend to be better when combined with something that prevents the bands from reattaching. Dermal fillers injected after subcision can hold the skin up while the area heals, and some fillers also stimulate the body’s own collagen production over time. Research has explored various fillers used alone or alongside other treatments to rebuild skin affected by acne scars.¹⁰ Following subcision with laser resurfacing or microneedling can further smooth the surface texture once the tethering has been addressed.

Treating Raised Scars

Hypertrophic scars and keloids from acne require the opposite strategy from atrophic scars. Instead of building tissue up, the goal is to flatten excess tissue down. The first-line treatment for most raised acne scars is intralesional injection of corticosteroids, which shrinks collagen and reduces inflammation within the scar. For stubborn cases, adding 5-fluorouracil (5-FU) to the injection can improve results. One study combining photodynamic therapy with intralesional 5-FU and corticosteroid injections found that scar lesions flattened and softened significantly, with most patients needing only one or two injection sessions.¹¹

Silicone-based products are a useful at-home adjunct. Silicone gel sheets and topical silicone gels work by keeping the scar hydrated and occluded, which appears to calm the overactive cells responsible for excess collagen production.¹² Imaging studies have confirmed that silicone sheeting effectively hydrates the skin directly beneath it.¹³ Silicone products are not going to erase a keloid, but they can be a worthwhile part of a broader plan, especially in the early months after a scar forms when the healing process is still active.

Red Marks and Dark Spots

Many people who think they have permanent scars actually have post-inflammatory color changes that can resolve with the right approach. Post-inflammatory erythema (PIE) shows up as persistent red or pink patches, most visible in lighter skin tones. Post-inflammatory hyperpigmentation (PIH) appears as brown or dark patches and is more common and conspicuous in darker skin tones. Neither involves textural damage to the skin, which distinguishes them from true scars, but they can last months or even years without treatment.

For red marks, light-based devices are the most effective option. A systematic review of post-acne erythema treatments found that pulsed dye lasers were the most commonly used and effective devices.¹⁴ Pulsed dye lasers target hemoglobin in the dilated blood vessels responsible for the redness, causing them to coagulate and gradually be cleared by the body.¹⁵ Intense pulsed light (IPL) offers a similar mechanism, using a wavelength filter that zeroes in on the absorption peaks of hemoglobin to selectively damage superficial blood vessels.¹⁶

Dark spots respond to a different set of tools. Topical depigmenting agents are the mainstay. These include hydroquinone, azelaic acid, kojic acid, retinoids, vitamin C, niacinamide, and arbutin, all of which work by interfering with melanin production or transfer at various points in the pigmentation pathway.¹⁷ A systematic review of treatments for PIH in darker skin tones noted that even newer agents like thiamidol combined with sunscreen showed meaningful improvement.¹⁸ Sun protection is non-negotiable for PIH: UV exposure darkens existing spots and slows fading. If you are treating dark spots without wearing sunscreen daily, you are essentially running on a treadmill.

Why Combination Treatments Usually Win

One of the clearest findings in acne scar research is that combining treatments typically outperforms relying on any single procedure. A network meta-analysis of therapies for moderate-to-severe atrophic scars concluded that combination approaches generally beat monotherapies, with fractional CO2 laser plus subcision or platelet-rich plasma (PRP) showing the most consistent benefits.¹⁹ This makes sense when you consider that most people have a mix of scar types, and each type responds to a different mechanism of action.

A practical example is the “triple approach” combining CROSS, subcision, and microneedling. CROSS targets deep narrow scars by stimulating new collagen from the bottom, subcision releases tethered rolling scars, and microneedling stimulates broad-area collagen remodeling across the surface. Case series using this combination have shown consistently high patient satisfaction and visible photographic improvement.²⁰ The treatment plan your dermatologist designs should reflect the specific mix of scar types on your face, not a one-size-fits-all protocol.

Platelet-Rich Plasma as an Add-On

PRP has attracted a lot of attention as a way to boost results when paired with other procedures. The idea is straightforward: a small amount of your own blood is drawn, spun down to concentrate the platelets, and then applied to the treatment area. Those platelets release growth factors that amplify the wound-healing cascade already triggered by microneedling or laser treatment.²¹

An overview of systematic reviews confirmed that adding PRP to microneedling or laser therapy consistently produced greater clinical improvement and higher patient satisfaction compared to the same procedures without PRP. An additional practical benefit: PRP-treated areas showed shorter crusting time and less prolonged redness after treatment.²² A systematic review in the Journal of the American Academy of Dermatology found that activated, leukocyte- and platelet-rich plasma combined with fractional ablative laser, given over two or three sessions a month apart, improved acne scar appearance with decreased post-procedure downtime.²³ PRP is not a standalone scar treatment, but as an add-on to procedures you would already be getting, the evidence for it is solid.

Skin Tone Matters for Treatment Safety

If you have a medium to dark skin tone, treatment selection requires extra care. Energy-based devices like lasers and intense pulsed light carry a real risk of causing the very thing you are trying to fix: new patches of hyperpigmentation. A study of nonablative fractional laser in patients with darker skin found that post-inflammatory hyperpigmentation was a common side effect, especially at higher treatment densities. In the higher-density group, five out of seven patients developed mild or moderate hyperpigmentation after treatment.²⁴

This does not mean you should avoid lasers entirely, but it does mean the settings matter enormously. Lower densities and longer intervals between sessions reduce the risk. Microneedling and microneedle radiofrequency tend to be safer options in darker skin because they do not target melanin the way lasers do. Subcision is another good option since it works mechanically beneath the surface. The CROSS technique has also been used across skin types. Combined approaches using subcision, TCA peel, and fractional erbium laser have been studied specifically in people with darker skin tones and shown effective results.⁹ The key is working with a provider experienced in treating your skin type, and being willing to accept a more conservative, gradual treatment plan to avoid trading scars for new pigmentation problems.

Prevention and Early Intervention

The most effective scar-minimizing strategy is preventing scars from forming in the first place. This is not empty advice. Research has shown that the same inflammatory process that drives acne lesion formation also drives scarring, which means treating acne early and aggressively can reduce the number of scars that develop.²⁵ Every inflamed cyst or nodule that is left to resolve on its own is a roll of the dice for permanent scarring.

Topical retinoids deserve special mention here. They are the backbone of acne treatment, but they also appear to play a direct role in scar prevention and even modest scar improvement. Retinoids affect skin cell turnover, reduce inflammation, influence fibroblast activity, and promote collagen remodeling. Evidence indicates they can improve the appearance of existing atrophic scars, slow the progression of scarring, and support skin remodeling alongside other treatments.²⁶ A prescription retinoid is not going to replace procedural treatments for established scars, but it can serve as a useful baseline that you maintain between sessions and long after treatment is complete.

The Emotional Weight of Acne Scars

The push to treat acne scars is not purely cosmetic vanity. Research consistently shows that the presence of acne scarring is associated with meaningfully worse quality-of-life scores, greater psychological distress, and more time and money spent concealing the damage.²⁷ A multi-country survey of over 700 adults with facial acne scars but no active acne used validated questionnaires to assess the burden, and found that scarring alone was enough to affect daily life and body image.²⁸

Yet the tools for measuring this impact in clinical settings remain underdeveloped. A review of patient-reported outcome instruments for acne found that only two out of 54 surveys had sufficient measurement properties for clinical use, and only one of those, the ACNE-Q, specifically addressed the impact of post-acne scarring.²⁹ This gap matters because it means treatment outcomes in clinical trials are often measured by physician assessment of photographs rather than by how much better the patient actually feels. If you are pursuing scar treatment, your own satisfaction and emotional relief should be a primary measure of success, not just what the camera shows.

1
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2
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3
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7
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9
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10
PubMed Central. Dermal Fillers in the Treatment of Acne Scars: A Review
11
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PubMed Central. Platelet rich plasma use for treatment of acne scars: an overview of systematic reviews
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