There is no single best acne scar treatment because the right approach depends entirely on the type of scar you have. A narrow ice pick scar and a wide, rolling depression are caused by different structural problems beneath the skin, and they respond to different procedures. The most effective results typically come from combining treatments targeted to your specific scar types rather than relying on one method alone.
Why Scar Type Determines Treatment
Acne scars fall into two broad categories: indented (atrophic) scars, which are three times more common, and raised (hypertrophic or keloidal) scars. Within the indented group, there are three distinct shapes, each caused by a different kind of tissue damage.
Ice pick scars are narrow, deep, V-shaped pits less than 2 mm wide that extend deep into the skin. They account for 60 to 70 percent of all atrophic acne scars and are the hardest to treat because of their depth and narrow opening.
Boxcar scars are wider (1.5 to 4 mm), round or oval depressions with sharp vertical edges, like a U-shape pressed into the skin. They can be shallow or deep. These make up 20 to 30 percent of indented scars.
Rolling scars are broad, gentle dips (usually wider than 4 to 5 mm) that give the skin a wavy, undulating look. They’re caused by bands of scar tissue pulling the surface skin down toward the deeper fat layer. They represent 15 to 25 percent of indented scars.
Hypertrophic and keloidal scars are firm, raised, pink bumps caused by excess collagen buildup. Hypertrophic scars stay within the borders of the original breakout, while keloids grow beyond them. These require a completely different treatment strategy focused on flattening and softening the tissue rather than rebuilding it.
Fractional Laser Resurfacing
Fractional lasers are the workhorse treatment for moderate to severe acne scarring, particularly boxcar and rolling scars. They work by creating thousands of tiny columns of controlled injury in the skin, which triggers the body to produce fresh collagen and elastin as it heals. The surrounding untreated skin speeds recovery.
There are two main types. Ablative fractional lasers (like the fractional CO2 laser) physically vaporize the outer skin layer and part of the deeper layer beneath it, producing the most dramatic remodeling. They also come with the most downtime: redness typically takes 3 to 10 days to subside, and full healing can stretch longer. The average cost is around $2,000 per session.
Non-ablative fractional lasers heat the deeper skin without removing the surface, so recovery is faster, often just a day or two of redness. They cost roughly $1,100 per session on average. The trade-off is that non-ablative lasers generally require more sessions to achieve comparable results. Most people need three to six sessions of either type, spaced several weeks apart.
An alternative ablative laser uses a wavelength that is more strongly absorbed by water in the skin, allowing precise tissue removal with less heat spread to surrounding tissue. This means less risk of pigment changes and a gentler recovery, which can matter for people with darker skin tones.
Subcision for Rolling Scars
Rolling scars are uniquely caused by fibrous bands tethering the skin’s surface down to the fat layer below. Lasers alone often can’t fix this structural problem. Subcision addresses it directly: a small instrument is inserted beneath the scar and fanned back and forth to physically shred apart those tethering bands.
Once released, the skin lifts. The controlled injury also triggers new connective tissue growth that fills the space underneath. Fat beneath the scar gets redistributed more evenly, smoothing out contour irregularities.
Subcision works well on its own, but combining it with a filler injection afterward significantly improves results. In one comparison study, subcision alone produced clinical improvement in 67 percent of patients. When a hyaluronic acid filler was injected after subcision to prop the skin up while it healed, that number jumped to 94 percent. The filler restores volume and prevents the tethering bands from reattaching. Other common additions to subcision include platelet-rich plasma, chemical peels, and laser resurfacing.
TCA Cross for Ice Pick Scars
Ice pick scars are notoriously resistant to lasers and microneedling because they’re so narrow and deep. The most targeted treatment is a technique called TCA CROSS, which stands for Chemical Reconstruction of Skin Scars. A tiny amount of high-concentration trichloroacetic acid (up to 100 percent) is applied directly into each individual scar using something as precise as a wooden toothpick.
The acid triggers intense, focused inflammation deep inside the scar tract, which stimulates new collagen to form from the bottom up. You’ll feel mild burning during application, followed by some redness and swelling that fades within four to six hours. A small crust forms the next day and falls off within three to four days for most people. Sessions are repeated every two weeks, with a typical course of about four treatments. Final results continue to develop for months afterward, with follow-up assessments often done at three and six months after the last session.
This technique is inexpensive, minimally invasive, and specifically effective for ice pick scars that other treatments struggle with.
How Much Topical Products Can Do
Prescription retinoids like adapalene can improve the appearance of acne scars, but their effects are modest compared to in-office procedures. In a clinical study of adapalene 0.3% gel used for 24 weeks, investigators rated improvement in skin texture and scar appearance in about 50 percent of subjects, while over 80 percent of the patients themselves felt their scars looked better.
The mechanism involves increased cell turnover that thickens the outer skin layer, making shallow scars less visible. There were also signs of increased collagen production in the deeper skin, though these changes did not reach statistical significance. The key finding: while scars became less noticeable and skin texture improved, the actual number of scars did not decrease meaningfully. Topical retinoids are a reasonable starting point for mild, shallow scarring, and they complement procedural treatments, but they won’t fill in deep ice pick or boxcar scars.
Treatment Considerations for Darker Skin
If you have medium to dark skin (Fitzpatrick types IV through VI), acne scar treatment requires extra caution. Darker skin produces more melanin in response to inflammation, which means any procedure that injures the skin carries a higher risk of post-inflammatory hyperpigmentation, the dark spots that can linger for months and sometimes look worse than the original scars.
Ablative lasers pose the greatest risk because they create the most surface damage. Non-ablative lasers are generally safer for darker skin tones, with studies showing they can effectively improve atrophic scars while keeping side effects manageable, though hyperpigmentation still occurs and needs to be monitored. Lower-energy settings, longer intervals between sessions, and pre-treatment with skin-lightening agents can reduce the risk. Microneedling and subcision tend to carry lower pigmentation risk than lasers because they cause less thermal damage to the skin’s surface.
Matching Treatment to Your Scars
Most people have a mix of scar types, which is why combination protocols produce the best outcomes. A practical framework:
- Ice pick scars: TCA CROSS is the first-line option. Laser resurfacing alone rarely reaches deep enough.
- Shallow boxcar scars: Fractional laser resurfacing or microneedling can smooth the edges and stimulate collagen to fill the depression.
- Deep boxcar scars: Often benefit from a punch excision (surgically removing the scar) or a combination of subcision and laser.
- Rolling scars: Subcision to release the fibrous bands, ideally followed by filler or energy-based treatment to maintain the lift.
- Hypertrophic or keloidal scars: Steroid injections to flatten the tissue, sometimes combined with silicone sheeting or laser treatments designed to break down excess collagen.
Results from any scar treatment develop gradually. Collagen remodeling takes months, and most procedures require multiple sessions. Expect to commit to a treatment plan spanning three to twelve months before judging final outcomes. Starting with a professional evaluation of your specific scar types is the most reliable way to avoid spending money on treatments that aren’t matched to the structural problem underneath your skin.