Acne scars can be significantly improved with the right combination of treatments, but what works best depends on the type of scar you have. Shallow, depressed scars respond well to resurfacing treatments and topical products, while deep pitted scars and raised scars each require more targeted approaches. No single treatment erases all acne scars completely, but most people see meaningful improvement over several months of consistent treatment.
Why Scar Type Matters
Not all acne scars form the same way, and treatments that work well for one type can be ineffective for another. Most acne scars fall into two broad categories: depressed scars (where tissue was lost during healing) and raised scars (where the body overproduced collagen).
Depressed scars break down further into three common shapes. Ice pick scars are deep and narrow with sharp edges, almost like a puncture wound. Boxcar scars are broader with defined vertical walls, similar to a small crater. Rolling scars have gentle, sloped edges that create a wave-like texture across the skin. Raised scars, called hypertrophic or keloid scars, sit above the skin’s surface as firm, sometimes puffy tissue. Identifying which types you have is the first step toward choosing effective treatment.
Topical Treatments That Build Collagen
For mild scarring, prescription retinoids like tretinoin can make a real difference over time. Retinoids work by slowing the breakdown of existing collagen while stimulating new collagen production in the deeper layers of skin. In one clinical study, 91.4% of patients saw significant improvement in their acne scars after 12 weeks of using a retinoid-based combination treatment. The improvement comes with visible reversal of skin thinning and increased collagen density beneath the surface.
Retinoids won’t dramatically reshape a deep ice pick scar, but they can soften shallow depressions and improve overall skin texture. They’re also useful as a long-term maintenance strategy alongside professional procedures. Over-the-counter retinol products are weaker versions of prescription tretinoin and take longer to produce results, but they follow the same basic mechanism.
Microneedling
Microneedling uses tiny needles to create controlled micro-injuries in the skin, triggering your body’s wound-healing response and generating new collagen. Devices range from rollers to motorized pens, with needle depths from 0.25 mm up to 3.0 mm depending on the severity of scarring. Deeper scars generally require longer needles and treatment by a trained professional.
Most clinical studies use three to six sessions spaced two to four weeks apart. Some protocols extend treatments over 12 weeks with sessions at the six-week mark. Results are cumulative, meaning each session builds on the collagen generated by the previous one. You won’t see dramatic changes after a single session, but the texture improvements become more noticeable with each round.
Cost typically runs $200 to $700 per session for standard microneedling. Adding platelet-rich plasma (PRP), where a concentration of your own blood’s growth factors is applied during treatment, raises the price to around $750 per session. Radiofrequency microneedling, which adds heat energy to boost collagen stimulation, averages around $1,525 per session. These add-ons can accelerate results but aren’t strictly necessary for improvement.
Laser Resurfacing
Fractional CO2 lasers are one of the most effective options for depressed acne scars. The laser creates a grid of tiny columns of heat in the skin, vaporizing damaged tissue while leaving surrounding skin intact. Those untreated zones act as healing reservoirs, allowing skin cells to migrate inward and repair quickly. In the deeper layers, the heat triggers collagen proliferation and structural remodeling that continues for months after treatment.
A meta-analysis of fractional CO2 laser studies found that patients scored significantly higher in skin smoothness compared to other treatment methods. The laser’s deep mode can reach into the dermis, the thick middle layer of skin where collagen lives, making it particularly effective for boxcar and rolling scars that involve structural loss beneath the surface.
Recovery from fractional laser treatment involves several days of redness, swelling, and peeling. Full collagen remodeling takes three to six months, so the final result isn’t immediately visible. Most people need two to three sessions spaced several weeks apart.
Subcision for Rolling Scars
Rolling scars often have fibrous bands of scar tissue tethering the skin surface down to deeper structures. Subcision involves inserting a small needle beneath the scar to physically break those bands, releasing the skin so it can rise back to its normal level. The controlled injury underneath also stimulates new collagen formation as the area heals.
During the first week after subcision, mild swelling and bruising are typical. Gradual improvement begins around four to six weeks as new collagen forms and the released skin settles into a smoother position. Full results develop over three to six months as collagen continues to build. Subcision works especially well when combined with other treatments like microneedling or fillers in the same area.
Fillers for Volume Loss
When scars create noticeable depressions, injectable fillers can restore volume beneath them, physically lifting the indented skin back to the surrounding level. This approach is particularly effective for rolling scars and wider boxcar scars.
How long fillers last depends on the material used. Hyaluronic acid fillers (brands like Restylane and Juvederm) are temporary and need reinjection every few months. A collagen-based filler called Bellafill generally lasts around 12 months for acne scars. Poly-L-lactic acid is considered semi-permanent, requiring only occasional touch-ups after the initial treatment series. Fat transfer, where fat is harvested from another part of your body and injected into the scars, can be permanent once the transplanted fat establishes a blood supply.
TCA CROSS for Deep Ice Pick Scars
Ice pick scars are notoriously difficult to treat because they’re narrow and deep. A technique called TCA CROSS was developed specifically for this type. A high concentration of trichloroacetic acid (70 to 100%) is applied directly into the base of each individual scar using a fine-tipped instrument like a toothpick. The acid causes controlled destruction of the scar’s inner walls, and as the tissue rebuilds, new collagen gradually fills the scar from the bottom up.
The application takes only seconds per scar. The skin frosts white almost immediately, and a small scab forms over each treated scar during healing. Multiple sessions are typically needed, spaced several weeks apart, with the scar becoming progressively shallower each time. This targeted approach avoids treating the healthy skin surrounding each scar, which keeps recovery time relatively short.
Considerations for Darker Skin Tones
If you have medium to dark skin, the risk of post-inflammatory hyperpigmentation (PIH), where treated areas heal darker than surrounding skin, is a real concern with many scar treatments. Lasers, chemical peels, and aggressive resurfacing procedures can trigger new discoloration if performed incorrectly, potentially making the cosmetic issue worse rather than better.
Harvard Health emphasizes that these procedures should be performed by a dermatologist with specific expertise in treating darker skin types, since incorrect technique can lead to skin injury and worsening of both scarring and pigmentation. Lower-energy laser settings, gentler chemical concentrations, and microneedling (which doesn’t rely on light or heat that interacts with melanin) are often safer starting points. Topical retinoids are generally well tolerated across all skin tones and can address both mild scarring and residual dark spots simultaneously.
What a Realistic Timeline Looks Like
Collagen remodeling is a slow biological process. Nearly every effective acne scar treatment works by triggering your body to rebuild its own structural tissue, and that rebuilding happens over months, not days. Topical retinoids take at least 12 weeks of consistent use before meaningful improvement appears. Professional procedures like microneedling and laser resurfacing show progressive improvement over three to six months after a full course of treatment. Subcision follows the same timeline.
Most people with moderate to severe scarring benefit from combining approaches. A dermatologist might use subcision to release tethered rolling scars, follow up with microneedling or laser to resurface the area, and apply TCA CROSS to any remaining ice pick scars individually. This layered strategy addresses different scar types at different depths, producing more comprehensive results than any single treatment alone. Expect the full process, from first treatment to final result, to take six months to a year for significant improvement.