The best treatment for acne scars depends on the type of scar you have. Shallow, wave-like scars respond well to fillers and subcision, while deep narrow scars need targeted techniques like chemical reconstruction or punch excision. For most people with moderate scarring, fractional laser resurfacing delivers the broadest improvements, with efficacy rates up to 90% for depressed scars. But the real key is matching the right treatment to your specific scar shape.
Why Scar Type Matters More Than Any Single Treatment
Acne scars fall into three main categories, and each one sits differently in the skin. Ice pick scars are small, narrow holes that plunge deep into the skin, often on the cheeks. Boxcar scars are wider, oval or rectangular depressions with sharp, defined edges and a flat bottom, typically 0.1 to 0.5 mm deep. Rolling scars are the broadest, spanning 4 to 5 mm wide with sloped edges that create a wavy, undulating appearance across the skin’s surface.
These differences matter because a treatment that works beautifully on rolling scars can be nearly useless on ice pick scars. Ice pick scars are notoriously resistant to surface-level treatments because they extend so deep. Rolling scars, on the other hand, are caused partly by fibrous bands pulling the skin down from underneath, so they respond to techniques that release that tethering. Any effective treatment plan starts with identifying which scars you actually have, and most people have a mix.
Fractional Laser Resurfacing
Fractional lasers are considered the first-line treatment for depressed acne scars. They work by drilling microscopic columns of damage into the skin, leaving healthy tissue between each column so healing happens faster than with older full-surface lasers. As the skin repairs itself, it produces new collagen that gradually fills in and smooths the scarred areas.
In clinical studies, a single session of fractional CO2 laser produced 26 to 50% improvement in the majority of patients, with some achieving 51 to 75% improvement after just one treatment. By three months, a small percentage reached near-complete correction. Most people need two to four sessions spaced several weeks apart for optimal results. The tradeoff is recovery time: expect several days of redness, swelling, and peeling, with full healing taking one to two weeks. People with darker skin tones face a higher risk of post-treatment darkening (hyperpigmentation), so milder settings or alternative laser wavelengths are often used.
Fractional lasers work across all three scar types but perform best on boxcar and rolling scars. Deep ice pick scars typically need additional targeted treatment.
TCA CROSS for Deep, Narrow Scars
Chemical reconstruction of skin scars (CROSS) is a technique designed specifically for ice pick scars and deep boxcar scars. A dermatologist applies a high-concentration acid, usually 70% or higher, directly into each individual scar using a small wooden applicator. The acid triggers intense collagen production deep in the scar, gradually building new tissue from the bottom up.
This isn’t a one-and-done procedure. After three treatment sessions, about 20% of patients see excellent improvement (greater than 70% correction). That number climbs to 40% after five sessions and 70% after six sessions. Treatments are spaced two to four weeks apart. Each session causes a small white frost on the treated spots, followed by scabbing that resolves within a week or so. The technique is cost-effective compared to lasers and works well for darker skin tones, where aggressive laser treatment carries more risk.
Microneedling and RF Microneedling
Traditional microneedling uses a device covered in fine needles to create tiny punctures in the skin’s surface. These micro-injuries trigger the body’s repair process, boosting collagen and elastin production over the following months. Side effects are minimal: mild redness and swelling that resolve quickly, making it one of the gentlest in-office options.
RF (radiofrequency) microneedling takes this a step further. Each needle delivers heat energy deep into the dermis, causing collagen fibers to contract and triggering a significantly stronger healing response than needling alone. Traditional microneedling primarily affects the upper skin layers, while RF microneedling reaches deeper tissue, producing more collagen that forms at a greater depth. This makes RF microneedling notably more effective for moderate scarring, though it comes at a higher price point.
Head-to-head comparisons show that lasers still outperform microneedling for scar correction. One study found 70% improvement with a laser versus 30% with microneedling at three months. But microneedling has a much easier recovery and lower complication risk, which makes it a reasonable choice for mild scarring or for people who can’t take time off for laser downtime.
Subcision and Fillers for Rolling Scars
Rolling scars have a specific cause that surface treatments alone can’t fully address. Fibrous bands of scar tissue beneath the skin pull the surface downward, creating that uneven, wave-like texture. Subcision involves inserting a needle under each scar to physically cut those tethering bands, releasing the skin so it can sit flat again. Deeper, broader rolling scars show significantly greater improvement from subcision than smaller or shallower ones, while boxcar scars respond much less.
Dermatologists often pair subcision with injectable fillers for the best results on rolling scars. After the fibrous bands are released, a filler injected beneath the scar provides immediate volume and holds the skin up while new collagen forms. Rolling scars improve more with fillers than other scar types. One filler type that stimulates long-term collagen production showed greater than 75% patient satisfaction at two years, with some studies documenting benefits lasting up to four years. Simpler fillers based on hyaluronic acid (the same substance used in lip and cheek fillers) last three to six months and may need periodic touch-ups.
Punch Techniques for the Deepest Scars
When ice pick or deep boxcar scars are too narrow and deep for lasers or chemical peels to reach, punch excision offers a more direct solution. A tiny circular blade, matched to the scar’s diameter (usually 3 to 4 mm), cuts out the entire scar. The small wound is either stitched closed or filled with a skin graft taken from behind the ear. The result is a flat, barely visible line instead of a deep pit. This technique trades one type of mark for a much less noticeable one, and the remaining fine line can be further refined with laser resurfacing later.
What Topical Products Can Actually Do
Prescription retinoids are the only topical products with meaningful clinical evidence for improving acne scars, and even then, the results are modest compared to procedures. In one study, 79% of patients saw flattening of depressed scars after a course of tretinoin combined with mild chemical peels. Another 24-week study found that a newer retinoid called trifarotene significantly reduced acne scarring compared to placebo in over 100 patients. Adapalene at 0.3% strength improved skin texture by one to two grades in about 56% of users over 24 weeks.
Retinoids work by speeding up skin cell turnover and stimulating collagen remodeling, but the changes are gradual and subtle. They’re best suited for very mild scarring or as a maintenance treatment between procedures. Over-the-counter retinol products are weaker versions of prescription retinoids and will produce even more modest effects. No cream, serum, or at-home product will meaningfully improve moderate or deep acne scars on its own.
Combination Approaches Get the Best Results
The most effective acne scar treatment plans combine multiple techniques matched to each scar type on your face. A common evidence-based approach for someone with mixed scarring might look like subcision plus fillers for rolling scars, TCA CROSS for ice pick scars, and fractional laser resurfacing across the full area to smooth overall texture. Combining TCA CROSS with lasers or microneedling is widely used to enhance outcomes while keeping side effects manageable.
Results from any collagen-building treatment continue to develop for three to six months after the procedure, so patience matters. Most treatment plans involve multiple sessions over several months, with final results visible six months to a year after the last session. The cost adds up: a single fractional laser session typically runs $1,000 to $3,000, RF microneedling $300 to $700 per session, and filler injections $600 to $1,500 depending on the product and volume used. Few insurance plans cover cosmetic scar treatments, though coverage varies if scarring is classified as reconstructive.