Atrophic scars can be meaningfully improved but rarely erased entirely. These indented, pitted marks form because the skin lost collagen and elastic fibers during the healing process, leaving tissue that sits below the surrounding surface. The good news is that dermatology has developed a broad toolkit for raising, smoothing, and blending these scars, from topical creams to lasers to injectable fillers, and the best results usually come from combining more than one approach.
Why Atrophic Scars Look the Way They Do
When your skin heals from a deep wound or inflamed acne lesion, it sometimes can’t rebuild itself to its original thickness. The dermis, the layer underneath your skin’s surface, loses both collagen fibers and elastic fibers, and the replacement tissue that fills in is thinner and weaker than what was there before.1PubMed. Atrophic acne scar: a process from altered metabolism of elastic fibres and collagen fibres based on transforming growth factor-β1 signalling The result is a depression in the skin, a little valley where the tissue never fully recovered. Nearly every professional treatment for atrophic scars works by one shared logic: trigger the skin to produce new collagen in the scarred area so the depression fills in from below.
The Three Main Types of Atrophic Scars
Not all atrophic scars respond equally to the same treatment, and dermatologists classify them into three categories that influence which approach makes the most sense for you.
- Ice pick scars: Narrow, deep, V-shaped pits that extend well into the dermis. These tend to be the deepest of the three types, with one histological study measuring their average depth at roughly 1.9 millimeters.2PubMed. A cross-sectional pilot study evaluating the histopathology of atrophic acne scars with a focus on the vertical depth of ice pick, boxcar, and rolling scars and its implications in skin of colour Their narrow opening makes them resistant to treatments that work mainly on the surface.
- Boxcar scars: Wider depressions with sharply defined vertical edges, like a small crater. They average around 1.3 millimeters deep and respond to a broader range of resurfacing treatments because their walls are more accessible.
- Rolling scars: Broad, shallow undulations caused by fibrous bands pulling the skin surface downward from beneath. They’re about the same depth as boxcar scars on average but have a different underlying structure that often requires physically cutting the tethering bands loose.
Knowing which type you have matters because it shapes the treatment plan. Ice pick scars, for example, are too narrow and deep for most lasers to reach effectively, while rolling scars need a mechanical release that creams alone can’t provide. Many people have a mix of all three types, which is one reason combination treatments tend to outperform any single method.
Topical Treatments
Topical products are the most accessible starting point, though expectations should be realistic: they can soften the appearance of shallow scars and support other treatments, but they won’t fill in deep pits on their own. Tretinoin, a prescription retinoid, has the strongest evidence in this category. It slows the breakdown of existing collagen and stimulates new collagen production, and one study found it significantly decreased the depth of atrophic scars in the vast majority of treated patients.3PubMed Central. Retinoic acid and glycolic acid combination in the treatment of acne scars Over-the-counter retinol products work on the same principle but at lower concentrations, so improvements are more gradual.
Alpha hydroxy acids like glycolic acid help by accelerating cell turnover at the surface, which can improve texture and make shallow scars less noticeable over time. These are widely available in serums and peels. Vitamin C serums and niacinamide can help with discoloration around scars but do little for the actual depth of the depression. If you’re looking at topicals as your primary strategy, a prescription retinoid used consistently for several months is the most evidence-backed option, though it works best for mild, shallow scarring.
Microneedling
Microneedling uses a device studded with fine needles to create thousands of tiny punctures in the skin. These controlled micro-injuries trigger the body’s wound-healing response, which ramps up collagen and elastin production in the treated area.4PubMed Central. Microneedling in Dermatology: A Comprehensive Review of Applications, Techniques, and Outcomes The procedure has become one of the most popular options for atrophic scars because it works across a wide range of skin tones with a relatively low risk profile.
Professional microneedling devices reach needle depths of 1.5 to 2.5 millimeters, deep enough to stimulate remodeling in the mid-dermis where scar tissue sits. At-home dermarollers exist and are considerably cheaper, but their shorter needles mean they work mainly on surface texture rather than deep scar architecture.5PubMed Central. Microneedling with dermaroller Most people need three to six professional sessions spaced about four to six weeks apart to see meaningful improvement. The downtime is moderate: redness and mild swelling for a couple of days, with full healing in about a week.
Radiofrequency microneedling takes the concept further by delivering heat energy through the needle tips. This added thermal injury stimulates a stronger collagen response. Some evidence suggests that pairing radiofrequency microneedling with topical agents like lactic acid may produce better scar smoothness than microneedling alone.6PubMed Central. Microneedling in the treatment of atrophic scars: A systematic review of randomised controlled trials
The CROSS Technique for Ice Pick Scars
Ice pick scars are notoriously stubborn because most resurfacing tools can’t get to the bottom of such a narrow, deep pit. The CROSS technique, which stands for chemical reconstruction of skin scars, was developed specifically for this problem. A dermatologist uses a sharpened applicator to deposit high-concentration trichloroacetic acid (TCA) directly into individual scars, provoking a controlled inflammatory reaction that stimulates new collagen to fill in from below.7PubMed Central. An Assessment of the Efficacy and Safety of CROSS Technique with 100% TCA in the Management of Ice Pick Acne Scars
The results can be impressive for these otherwise-difficult scars. In one study using 100% TCA, the majority of patients showed more than 70% improvement after a series of sessions, with the remaining patients still achieving at least 50% improvement.8PubMed. Evaluation of CROSS technique with 100% TCA in the management of ice pick acne scars in darker skin types This study was specifically conducted in people with darker skin tones, which is encouraging because many aggressive treatments carry higher risks of discoloration in darker skin. The technique works better for ice pick scars than for boxcar scars, likely because the narrow channel of an ice pick scar concentrates the acid’s collagen-building effect more efficiently.9PubMed. Comparison of 70% and 100% concentration of trichloroacetic acid peeling efficacy with chemical reconstruction of skin scars technique in atrophic acne scar treatment Treatments are typically repeated every two to four weeks for several sessions.
Laser Resurfacing
Fractional lasers are among the most effective single treatments for atrophic scars. They work by drilling thousands of microscopic columns of controlled damage into the skin, leaving untouched tissue in between. This pattern lets the skin heal faster than if the entire surface were treated while still triggering a robust collagen-remodeling response.
Fractional CO2 lasers are the most well-studied option. They improve scars by promoting new blood vessel formation, stimulating orderly collagen deposition, and rebalancing the skin’s repair process at the molecular level.10PubMed Central. An Overview of the Mechanisms of Fractional CO2 Laser in Scar Treatment Because they’re ablative, meaning they vaporize tiny columns of skin, they produce the most dramatic improvement per session but also come with more downtime: expect about a week of redness, crusting, and sensitivity, with residual pinkness lasting several weeks.
Non-ablative fractional lasers (like the Fraxel 1550) heat the dermis without removing the surface, so downtime is shorter but more sessions are usually needed. Fractional picosecond lasers are a newer entrant that has shown promise for non-acne atrophic scars. In one study of patients treated with a fractional picosecond laser, over 90% showed measurable improvement in scar color, texture, and distortion, and about 75% of patients reported being satisfied or very satisfied with their results.11PubMed Central. Fractional picosecond laser treatment of non‐acne atrophic scars and scar erythema in Chinese patients
Subcision
Rolling scars have a specific structural problem: fibrous bands beneath the skin are pulling the surface downward like tiny anchors. Subcision addresses this directly. A dermatologist inserts a needle or small blade beneath the scar and sweeps it back and forth to sever those tethering bands, allowing the skin to release and float upward. The procedure also creates a pocket of blood beneath the scar, and the resulting healing process deposits new collagen in the space.
In clinical studies, subcision alone has produced mild improvement in about 60% of patients and moderate improvement in around 40%.12PubMed. Subcision in acne scar with and without subdermal implant: a clinical trial Those numbers may sound modest, but subcision is rarely used as a standalone treatment. Its real value is as a preparatory step: once the tethering bands are released, other treatments like lasers, microneedling, or fillers can work on a scar that is no longer being pulled down from below. Combining subcision with a dermal filler injected into the newly created pocket can prevent the bands from re-forming and boost the volume under the scar.
Injectable Fillers
Dermal fillers offer something no other scar treatment can: immediate visible improvement. By injecting a substance directly beneath the depression, the scar is physically raised to the level of the surrounding skin. Hyaluronic acid fillers are the most commonly used option. Beyond the instant volumizing effect, hyaluronic acid has been shown to promote collagen production over time, and a randomized trial demonstrated sustained improvement lasting up to two years without significant loss of results.13PubMed Central. Injectable Fillers for Atrophic Acne Scars: A Systematic Review of Mechanisms, Evidence, and Clinical Algorithms
For more permanent volumization, poly-L-lactic acid (sold under brand names like Sculptra) takes a different approach. Rather than filling space mechanically, it stimulates your body’s own fibroblasts to produce new collagen gradually. Results build over weeks to months and have been observed to last two years or longer.14PubMed Central. Injectable Poly-l-Lactic Acid: A Novel Sculpting Agent for the Treatment of Dermal Fat Atrophy After Severe Acne Fillers work best for rolling and boxcar scars with soft, sloping edges. Ice pick scars are usually too narrow for a filler to be injected into effectively.
Platelet-Rich Plasma and Regenerative Approaches
Platelet-rich plasma (PRP) involves drawing a small amount of your blood, spinning it in a centrifuge to concentrate the platelets and growth factors, and then applying or injecting it into the treated skin. PRP contains multiple active growth factors involved in tissue repair, including those that drive collagen production and new blood vessel formation.15Frontiers in Medicine. Combined Effect of Microneedling and Platelet-Rich Plasma for the Treatment of Acne Scars: A Meta-Analysis On its own, PRP has limited evidence for scar improvement. But when combined with microneedling, the pairing has consistently outperformed microneedling alone.16PubMed Central. Split-face Comparative Study of Efficacy of Platelet-rich Plasma Combined with Microneedling versus Microneedling alone in Treatment of Post-acne Scars The micro-channels created by the needles serve as delivery pathways, allowing the growth factors to penetrate deep into the dermis where they can influence the remodeling process.
Nanofat grafting is a newer regenerative technique that involves taking a small amount of your own fat, processing it into a fine emulsion rich in stem cells, and injecting it beneath scars. Early research suggests it is a feasible option for treating atrophic scars, though it remains more complex and costly than PRP.17Journal of Advances in Medicine and Medical Research. The Efficacy of Autologous Nanofat Versus Enhanced Nanofat with Adipose-Derived Stem Cells Transfers in the Treatment of Atrophic Post Acne Scars
Why Combination Treatments Usually Win
If there’s one consistent takeaway from the scar treatment literature, it’s that mixing methods produces better outcomes than relying on any single one. Each treatment attacks a different aspect of the problem: subcision releases the tethering, CROSS fills in the depth, microneedling remodels the surface. A case series using all three together, CROSS for focal collagen stimulation, subcision to release tethering, and microneedling for broad collagen induction, reported consistently high patient satisfaction and visible photographic improvement.18PubMed Central. A Combination Approach to Treating Acne Scars in All Skin Types: Carbolic Chemical Reconstruction of Skin Scars, Blunt Bi-level Cannula Subcision, and Microneedling-A Case Series A scoping review of TCA-based treatments found that more than half of the studies reviewed used combination protocols pairing TCA with microneedling and subcision.19Journal of Cosmetic Dermatology. Use of Trichloroacetic Acid in Treatment of Atrophic Acne Scars: A Scoping Review
A typical multi-step plan might start with subcision for any rolling or tethered scars, then CROSS for ice pick scars, followed by a series of fractional laser or microneedling sessions to smooth the overall surface. This kind of staged approach is usually spread across several months. Your dermatologist will likely tailor the sequence and spacing based on your specific scar types, skin tone, and tolerance for downtime.
Skin Tone and the Risk of Post-Inflammatory Hyperpigmentation
One of the most important considerations when choosing a scar treatment is your skin tone. People with darker skin (roughly Fitzpatrick types IV through VI) face a significantly higher risk of post-inflammatory hyperpigmentation (PIH), where the treatment itself triggers dark patches that can last months. This risk is real and well-documented with ablative laser procedures in particular.
Research has shown that both the energy level and the density of fractional laser treatment influence PIH risk in darker skin, with density possibly being the more important factor.20PubMed. The prevalence and risk factors of post-inflammatory hyperpigmentation after fractional resurfacing in Asians Using lower density settings and ensuring proper cooling can substantially reduce this risk. A recent study tested a novel peeling protocol applied before and after CO2 laser resurfacing and found that it significantly reduced PIH scores compared to laser alone, without compromising scar improvement.21PubMed Central. A Novel Peel to Prevent Post-Inflammatory Hyperpigmentation After CO(2) Resurfacing for Acne Scars
Microneedling and the CROSS technique are generally considered safer choices for darker skin tones because they cause less surface-level thermal damage. The CROSS study mentioned earlier was conducted specifically in people with darker skin and showed strong results without concerning rates of dyspigmentation.8PubMed. Evaluation of CROSS technique with 100% TCA in the management of ice pick acne scars in darker skin types If you have a darker complexion and are considering ablative laser treatment, ask your provider about their experience treating similar skin tones, their preferred energy and density settings, and whether pre-treatment protocols to suppress melanin production are part of the plan.
Measuring Progress With 3D Imaging
One frustration with scar treatment is that improvements can be subtle and hard to see in the mirror, even when real structural change is happening beneath the surface. Three-dimensional skin imaging technology has advanced to the point where it can objectively measure scar volume and depth with high repeatability. One validation study found that a specific volume-based measurement correlated strongly with clinical severity ratings and showed excellent consistency between repeated scans.22PubMed. Validation of 3D skin imaging for objective repeatable quantification of severity of atrophic acne scarring The measurements were most sensitive to scars larger than about two millimeters. If your provider has this technology, before-and-after volumetric scans can give you a more objective picture of how much collagen has been rebuilt than photos alone, which are easily skewed by lighting and angles.
The Emotional Weight of Atrophic Scars
Atrophic scars are not just a cosmetic concern, and minimizing their impact misses the reality of how they affect people’s lives. A large multi-country survey found that roughly a third of people with severe or very severe scars considered them an “extremely large” concern, and almost 17% of all participants with acne scars showed clinical features of body dysmorphia.23PubMed Central. Impact of Facial Atrophic Acne Scars on Quality of Life: A Multi-country Population-Based Survey Self-consciousness and worry about scars not improving were the two most common emotional responses, reported by roughly 68% and 75% of participants respectively.
A separate multinational study found that about a quarter of people with atrophic scars felt less attractive because of them, over a third avoided public appearances, and more than 40% felt their scars had negatively affected their relationships.24JAAD International. Evaluation of psychological well-being and social impact of atrophic acne scarring: A multinational, mixed-methods study Qualitative research has described a psychological trajectory that includes an early phase of confusion and denial, a middle period marked by anxiety, appearance monitoring, and impaired social functioning, and a gradual long-term adaptation that sometimes includes genuine personal growth but can also involve persistent behavioral avoidance even after the person has cognitively accepted their scars.25PubMed Central. The Psychological Journey of Patients with Atrophic Acne Scarring: A Qualitative Study Based on Uncertainty in Illness Theory If scars are significantly affecting your mood, social life, or self-perception, that is a legitimate reason to pursue treatment and also a reason to consider professional psychological support alongside it.
Why Early Acne Treatment Matters for Prevention
The most effective treatment for atrophic scars is preventing them from forming in the first place. Acne scarring can affect up to 43% of teenagers, and scars typically start developing within the first year of acne onset.26PubMed Central. Acne Scarring: Why We Should Act Sooner Rather Than Later This means the window for prevention is narrow and often missed when people delay seeking treatment, assuming acne will resolve on its own. Moderate-to-severe inflammatory acne is the primary driver of atrophic scar formation, so getting effective acne control early, whether through prescription retinoids, antibiotics, hormonal therapy, or isotretinoin, is the single most impactful thing you can do to avoid the need for scar revision later. If you’re dealing with active breakouts that are leaving marks behind, treating the acne aggressively now is more important than treating existing scars, because every new inflamed lesion risks creating another permanent depression.