Acne scars can be meaningfully reduced with the right combination of treatments, though the best approach depends on the type of scar you’re dealing with. Shallow, discolored marks often respond to topical products and sun protection alone, while deeper indentations or raised scars typically need professional procedures. Most people see noticeable improvement within three to six months of consistent treatment.
The first step is identifying what kind of scars you have. Atrophic scars sit below the skin’s surface and come in three shapes: ice pick (narrow and deep), boxcar (wide with sharp edges), and rolling (broad with a wavy texture). Raised scars, called hypertrophic or keloid scars, sit above the skin. Each type responds to different treatments, and mixing the wrong approach with the wrong scar can waste time and money.
Topical Treatments That Build Collagen
Retinoids are the most effective topical option for mild atrophic scars. Tretinoin, available by prescription, reduces the breakdown of existing collagen while stimulating new collagen production in the deeper layers of skin. A study published in the Indian Dermatology Online Journal found that 91.4% of patients using a combination of retinoic acid and glycolic acid showed significant scar improvement after 12 weeks. The clinical change comes from reversing the thinning of skin over the scar while rebuilding the collagen underneath.
Over-the-counter retinol works on the same principle but at lower strength, so results take longer. Pair retinoids with a glycolic acid product (used on alternate nights to avoid irritation) to speed up cell turnover on the skin’s surface. Vitamin C serums can also help by supporting collagen production and fading dark marks, though they won’t reshape a deep scar on their own.
Microneedling for Moderate Scars
Microneedling uses a device covered in fine steel needles to create controlled micro-injuries across the scarred area. Your skin responds by producing new collagen to repair those tiny punctures, and over multiple sessions, that fresh collagen gradually fills in depressed scars. For acne scarring, needles are typically 1.5 to 2 mm long to reach the superficial dermis. Deeper scars sometimes call for needles up to 2.5 to 3 mm, though that’s less common.
Professional microneedling sessions are usually spaced about four weeks apart. Most treatment plans involve three to six sessions before results plateau. The procedure works well for rolling and shallow boxcar scars but has limited impact on narrow ice pick scars. Redness and mild swelling last a few days, and you can typically return to normal activities within 48 hours. At-home derma rollers exist, but the shorter needle lengths (0.25 to 0.5 mm) improve product absorption and skin texture more than they remodel actual scar tissue.
Laser Resurfacing Options
Fractional lasers create tiny columns of controlled damage in the skin, triggering a more aggressive collagen remodeling response than microneedling alone. Two main types dominate acne scar treatment, and they differ primarily in how deep they go and how long recovery takes.
CO2 lasers penetrate deeper and generate more heat, which makes them effective for more severe scarring but also means more inflammation and a longer healing window. Expect 7 to 14 days (sometimes more) before your skin looks presentable again. Erbium lasers are gentler, with most patients returning to their routine in 3 to 5 days. Erbium works well for moderate acne scars and carries less risk of complications like prolonged redness or changes in skin color, making it a better fit for darker skin tones.
Both types usually require multiple sessions spaced several weeks apart. The tradeoff is straightforward: CO2 delivers more dramatic results per session but with more downtime and risk, while erbium offers a gentler path that may need additional treatments to reach the same endpoint.
Subcision for Rolling Scars
Rolling scars have a distinctive wavy, undulating appearance because fibrous bands of scar tissue underneath the skin are pulling the surface downward. Subcision directly addresses this. A needle is inserted beneath the scar to physically cut and release those tethering bands. The bleeding that occurs during the procedure is actually part of the treatment: the blood clot fills the newly created space under the skin, lifting the depressed area as it heals.
This technique works best for rolling scars and is not ideal for deep boxcar or ice pick scars. A typical treatment plan involves four sessions spaced four weeks apart, often combined with microneedling in the same visit to maximize collagen stimulation. Bruising is common and can last a week or two. The results are often among the most dramatic for rolling-type scarring because the procedure targets the exact structural problem causing the indentation.
TCA CROSS for Ice Pick Scars
Ice pick scars are the most stubborn type because they’re narrow and deep, which makes them resistant to surface-level treatments like lasers or microneedling. The TCA CROSS technique was designed specifically for this problem. A high concentration of trichloroacetic acid (typically 70 to 100%) is applied with a tiny wooden applicator directly into the base of each individual scar. The acid triggers intense, focused collagen production from the bottom of the scar upward, gradually filling it in over repeated sessions.
A study in the Journal of Pakistan Association of Dermatologists found that 60% of patients showed marked improvement, 30% showed moderate improvement, and the remaining 10% showed mild improvement. Patients who received five or six sessions with the highest concentration all achieved excellent results. Sessions are typically spaced two to four weeks apart. The treated spots form small scabs that heal within a week, and the procedure is inexpensive compared to laser treatments.
Dermal Fillers for Immediate Volume
If you want faster results, injectable fillers can physically lift depressed scars by adding volume beneath them. Hyaluronic acid fillers are the most commonly used, while a semi-permanent filler called polymethylmethacrylate is currently the only one with specific FDA approval for acne scarring in the United States.
A prospective clinical trial published in Dermatologic Surgery tracked hyaluronic acid filler injected into rolling atrophic scars and found significant reductions in both scar severity and scar count that held steady from 120 days all the way through 720 days (two years) with no side effects. That’s considerably longer than the 6 to 12 months most people associate with hyaluronic acid fillers in cosmetic use. Fillers don’t permanently fix the underlying collagen deficit, but they can provide a visible improvement while you pursue collagen-building treatments alongside them.
Treating Raised Scars
Hypertrophic and keloid scars require the opposite strategy from atrophic scars. Instead of building collagen, the goal is to break down excess scar tissue. Steroid injections are the standard first-line treatment: cortisone is injected directly into the raised scar monthly for up to six months, gradually flattening it. Larger keloids may respond better to pulsed-dye laser sessions spaced 4 to 8 weeks apart, sometimes combined with steroid injections for a stronger effect.
Compression dressings can help with newer keloids or prevent recurrence after surgical removal. These need to be worn 12 to 24 hours a day for 4 to 6 months to be effective, which makes compliance the biggest challenge. Prescription corticosteroid creams help with itchiness but won’t significantly flatten a raised scar on their own.
Why Sun Protection Matters for Scars
UV exposure directly worsens the dark marks that acne scars leave behind. The pigment-producing cells in and around a scar are already in an overactive state from the inflammation that created the scar. UV light amplifies this, making discoloration darker and more persistent. This is especially significant for people with medium to dark skin tones, who are more prone to post-inflammatory hyperpigmentation but may not routinely wear sunscreen.
Daily broad-spectrum sunscreen with at least SPF 30 is the minimum recommendation for anyone actively treating acne scars. Apply it every morning regardless of weather, and reapply every two hours during prolonged sun exposure. This single habit can mean the difference between a scar that fades in a few months and one that lingers for years. Protective clothing and avoiding peak sun hours provide additional benefit, particularly after procedures like laser resurfacing or chemical peels that leave skin temporarily more vulnerable to UV damage.
Combining Treatments for Better Results
Most dermatologists treat acne scars with a combination approach tailored to the specific scar types present on your skin. A common strategy for someone with mixed scarring might include subcision for rolling scars, TCA CROSS for ice pick scars, and fractional laser or microneedling across the entire area to improve overall texture. Fillers can be layered in for any remaining deep depressions.
Timing matters. Treatments are typically staggered so the skin can heal between procedures, with the most invasive steps done first. A realistic timeline for significant improvement with a combination approach is 6 to 12 months. Complete elimination of all scarring is rarely possible, but reductions of 50 to 70% in scar visibility are achievable for most people who commit to a full treatment plan. Starting with daily retinoid use and sunscreen while you explore professional options gives your skin a head start on the collagen remodeling process.