Acne scars fade through a combination of time, consistent skin care, and in many cases, professional treatments that trigger your skin to rebuild collagen in the scarred area. What works best depends on the type of scar you’re dealing with, whether it’s a flat dark mark, a shallow dip in the skin, or a deeper indentation. The good news is that nearly every type of acne scar can be visibly improved.
Dark Marks vs. True Scars
The first thing to figure out is whether you have actual scarring or post-inflammatory hyperpigmentation (PIH), the flat dark or reddish spots left behind after a breakout. PIH isn’t a true scar. It’s excess pigment deposited in the skin during the healing process, and it fades on its own over time, though that can take months to years without any intervention. If the mark is flat and the same texture as the surrounding skin, you’re dealing with PIH, and the strategies below for topical treatments and sun protection will likely be enough.
True acne scars involve a change in the skin’s texture. They come in a few distinct forms. Ice pick scars are small, narrow holes that point deep into the skin. Boxcar scars are wider depressions with sharp, defined edges. Rolling scars have sloped borders that give the skin a wavy, uneven look. Hypertrophic scars are the opposite: raised bumps of tissue that sit above the skin’s surface. Each type responds differently to treatment, which is why a one-size-fits-all approach rarely delivers the best results.
Topical Treatments That Build Collagen
Retinoids are the most proven topical option for improving acne scars. They work by speeding up skin cell turnover and boosting collagen production, which gradually smooths out shallow depressions and evens skin tone. Tretinoin, available by prescription, tends to show improvements in as little as two to three weeks, with full results around six weeks. Adapalene, which is available over the counter at lower strengths, typically takes eight to 12 weeks to show its full effect. Neither will erase deep scars, but for shallow texture changes and PIH, retinoids make a noticeable difference over a few months of consistent use.
Other topicals worth considering include vitamin C serums, which help brighten dark marks and support collagen synthesis, and niacinamide, which can reduce excess pigment production. Azelaic acid is another option that targets both discoloration and mild texture irregularities. These work best as part of a daily routine rather than a quick fix.
Why Sunscreen Matters for Scar Fading
UV exposure is one of the fastest ways to darken a healing scar and stall your progress. UVA rays penetrate deep enough to worsen hyperpigmentation, making marks that were already fading suddenly more visible again. Use a broad-spectrum sunscreen with at least SPF 30 every day, even on cloudy days and even if you’re mostly indoors near windows. Reapply every two hours if you’re outside, and more often if you’re sweating or swimming. This single habit can dramatically speed up how quickly dark marks resolve and prevent treated scars from darkening during recovery.
Chemical Peels for Shallow Scars
Chemical peels remove damaged surface layers of skin and stimulate new cell growth underneath. For acne scars, medium-depth peels tend to deliver the most meaningful improvement. Glycolic acid peels at higher concentrations (up to 70%) and trichloroacetic acid (TCA) peels at 30% or above both penetrate to the upper dermis, where they can trigger collagen remodeling in shallow boxcar and rolling scars. Lower-concentration peels, like the 10 to 30% glycolic peels found in some at-home products, primarily help with surface discoloration and mild texture but won’t reach deep enough for true scar remodeling.
Professional peels are typically done in a series of sessions spaced a few weeks apart. You can expect redness, peeling, and sensitivity for several days after each session. Results build over time as new collagen fills in beneath the scarred area.
Microneedling and Collagen Induction
Microneedling uses fine needles to create controlled micro-injuries in the skin, which triggers your body’s wound-healing response and produces new collagen in the process. The depth of the needles matters significantly. Shallow scars generally respond to needle depths of 0.5 to 1.0 mm. Moderate boxcar scars typically need 1.0 to 1.5 mm. Deeper rolling scars, which are tethered to underlying tissue by fibrous bands, often require 1.5 to 2.5 mm depths to break those bands and lift the scar floor. Research has found that 2.5 mm depths produce significantly better improvement than 1.5 mm for atrophic scars after six sessions.
Ice pick scars are the trickiest for microneedling alone because they’re so narrow and deep. They often need a combination approach, sometimes pairing microneedling with a targeted chemical treatment applied directly into the scar.
The FDA has not authorized any microneedling devices for over-the-counter sale and recommends choosing a trained provider for the procedure. At-home derma rollers carry real risks: infection, skin damage, dark or light spots, and potentially worsening scars if used incorrectly. If you do own one, never share it, always use a clean cartridge, and recognize that home devices can’t safely reach the depths needed for meaningful scar treatment.
Laser Resurfacing for Deeper Scars
Fractional CO2 laser treatment is one of the more aggressive options for depressed acne scars. The laser creates tiny columns of controlled damage in the skin, leaving surrounding tissue intact so it can heal faster. This stimulates significant collagen production in the treated zones. A meta-analysis of studies on fractional CO2 laser for depressed scars found an average improvement rate of about 38% after two treatment courses, with no serious adverse reactions reported.
Most treatment plans involve three to five sessions, though some people see worthwhile improvement after a single session. Recovery involves several days of redness, swelling, and peeling, and the skin remains sensitive for weeks afterward. Full collagen remodeling continues for months after the last session, so final results aren’t immediately visible. Laser works well for boxcar and rolling scars but is less effective for narrow ice pick scars.
Subcision for Tethered Scars
Some rolling and boxcar scars are held down by fibrous bands beneath the skin’s surface, pulling the scar tissue downward and preventing it from responding to surface-level treatments. Subcision addresses this directly. A provider inserts a small needle beneath the scar and moves it in a fan-like motion to physically cut those fibrous strands. You can sometimes hear a snapping sound as the bands release. Once the tethering is broken, the scar tissue can rise closer to the level of surrounding skin.
Subcision is often combined with other treatments like microneedling, fillers, or laser to maximize results. It’s particularly useful when surface treatments have plateaued and the scar still appears depressed.
Matching Treatment to Scar Type
The most effective approach depends on what you’re working with:
- Flat dark marks (PIH): Retinoids, vitamin C, sunscreen, and time. Most fade within months.
- Shallow boxcar or rolling scars: Chemical peels, microneedling, or retinoids can produce visible improvement.
- Deep rolling scars: Subcision to release tethered bands, followed by microneedling or laser resurfacing.
- Ice pick scars: These rarely respond well to a single treatment. TCA applied directly into the scar (called TCA CROSS), sometimes combined with microneedling or laser, tends to work best.
- Raised (hypertrophic) scars: Silicone sheets, corticosteroid injections, or laser treatments designed to flatten excess tissue.
Many people have a mix of scar types, which is why dermatologists often recommend a combination of treatments rather than relying on just one. Results are cumulative. Each session or month of consistent topical use builds on the last, and realistic expectations matter. The goal with most acne scar treatments is significant improvement, not complete erasure. Even a 30 to 40% improvement in scar depth can make a dramatic visual difference in how skin looks and feels.