Acne scars fade with a combination of consistent skincare, professional treatments, and time, but the right approach depends entirely on what type of scar you’re dealing with. Roughly 80 to 90 percent of acne scars involve a loss of collagen, leaving indentations in the skin. The remaining minority are raised scars. Knowing which kind you have is the first step toward choosing something that actually works.
Identify Your Scar Type First
Depressed (atrophic) scars come in three shapes. Ice pick scars are narrow, less than 2 millimeters wide, and form deep V-shaped pits that extend well below the skin’s surface. Boxcar scars are wider, round or oval with sharp vertical edges, forming a U shape. Rolling scars are the widest, typically over 4 to 5 millimeters, and create a wave-like unevenness across the skin because fibrous bands pull the surface downward from underneath.
Raised (hypertrophic) scars and keloids are less common. They form thick, elevated tissue where the skin overproduced collagen during healing. Each type responds to different treatments, so a method that works beautifully on rolling scars may do nothing for ice pick scars.
What You Can Do at Home
Prescription retinoids are one of the most effective topical options. Tretinoin stimulates collagen production and accelerates collagen recycling, which gradually fills in depressed scars and improves skin texture. It also reduces excess pigment by slowing melanin production. Results take patience: a study on 0.05% tretinoin applied daily showed measurable improvements in skin elasticity after a full year of use. If you can’t access a prescription, over-the-counter retinol works through the same pathways but at lower strength, so expect a slower timeline.
For dark or red marks left behind by acne (post-inflammatory hyperpigmentation or erythema), azelaic acid is worth trying. It blocks the enzyme responsible for melanin production, which helps even out discoloration on both light and dark skin tones. It also reduces inflammation, so it pulls double duty if you still get occasional breakouts. Niacinamide works through a similar brightening pathway and pairs well with azelaic acid. Both are available without a prescription in serums and creams, typically in concentrations of 10 to 20 percent for azelaic acid and 5 percent for niacinamide.
Why Sunscreen Matters More Than You Think
UV light and even visible light directly stimulate the cells that produce pigment. When skin is inflamed or healing from acne, those pigment-producing cells are already in overdrive. Sun exposure amplifies the process, generating reactive oxygen species that push melanin production higher and make dark marks darker and longer-lasting. Long-wave UVA and high-energy visible light (the blue light range) are particularly problematic for darker skin tones, where they trigger sustained pigment activity.
A broad-spectrum sunscreen rated SPF 50 or higher, applied daily, is one of the simplest things you can do to prevent scars from worsening. If you’re using tretinoin or azelaic acid, sun protection becomes even more critical because those ingredients increase your skin’s sensitivity to UV.
Microneedling for Moderate Scars
Microneedling uses tiny needles to create controlled micro-injuries in the skin, triggering a wound-healing response that generates fresh collagen. It works well for rolling and boxcar scars, where the goal is to rebuild volume beneath the surface. A clinical study of six sessions spaced two weeks apart found 20 to 25 percent improvement in skin texture after the first month. By three months, patients showed 50 to 60 percent improvement in scar appearance, with satisfaction ratings reaching 80 to 85 percent.
Most people need four to six sessions to see meaningful results. The procedure causes redness and mild swelling for a day or two, but recovery is relatively quick compared to laser treatments. Some providers combine microneedling with platelet-rich plasma or topical serums applied immediately after, though the needling itself does the heavy lifting.
Laser Treatments for Deeper Resurfacing
Fractional lasers are among the most effective professional treatments for atrophic acne scars. They remove tiny columns of damaged skin while leaving surrounding tissue intact, which speeds healing while still triggering significant collagen remodeling.
Two main types dominate. Fractional CO2 lasers penetrate deeper and produce more dramatic results, especially for severe scarring. They completely remove the outer skin layer and partially ablate the layer beneath, forcing the skin to rebuild with new collagen and elastin. The tradeoff is about a week of downtime, with redness, swelling, and peeling. Erbium YAG lasers are gentler. They ablate tissue more precisely with less heat damage, which means faster recovery and a lower risk of post-treatment darkening, making them a better fit for darker skin tones. Comparative studies show CO2 lasers outperform erbium YAG for overall scar improvement, but the right choice depends on your skin tone, scar severity, and how much downtime you can handle.
Non-ablative lasers (which heat deeper layers without removing surface skin) offer even less downtime but require more sessions for comparable results. They’re a reasonable starting point if you want gradual improvement without the recovery period of ablative options.
TCA CROSS for Ice Pick Scars
Ice pick scars are notoriously resistant to broad resurfacing treatments because they’re so narrow and deep. The CROSS technique (chemical reconstruction of skin scars) addresses this by applying high-concentration trichloroacetic acid directly into each individual scar using a fine applicator like a toothpick. The acid triggers controlled inflammation deep in the pit, which then heals by producing new collagen from the bottom up, gradually raising the scar to skin level.
In a clinical study using this method over four sessions spaced two weeks apart, 80 percent of patients achieved greater than 70 percent improvement, and the remaining 20 percent saw 50 to 70 percent improvement. It’s performed in a dermatologist’s office and typically requires multiple sessions, but it’s one of the few treatments that consistently improves ice pick scars.
Fillers for Instant Volume
Injectable fillers physically raise depressed scars by adding volume beneath them. They work best on rolling scars and wider boxcar scars where the skin is intact but sunken. Hyaluronic acid fillers provide immediate results that last up to 18 months before the body gradually absorbs them. Poly-L-lactic acid is a semi-permanent option that stimulates your own collagen production over time, with effects lasting two to three years. Calcium hydroxyapatite fillers last up to 18 months and also encourage new collagen formation.
One permanent filler, polymethylmethacrylate, received FDA approval specifically for moderate to severe atrophic acne scars in 2014. Permanent fillers carry higher stakes if something goes wrong, so they’re typically reserved for scars that haven’t responded to other treatments. Most dermatologists start with temporary options to see how your skin responds before considering anything long-lasting.
Silicone Sheets for Raised Scars
If your scars are raised rather than indented, the approach flips. Instead of building collagen, the goal is to slow its overproduction. Silicone gel sheets have been used since the 1980s and remain one of only two treatments with strong clinical evidence for hypertrophic scars and keloids (the other being corticosteroid injections).
Silicone works by hydrating the outer layer of scar tissue, which signals the underlying cells to dial back collagen production. Studies report an 86 percent improvement in scar texture, 84 percent in color, and 68 percent in height. You wear the sheets over the scar for several hours daily, and results develop over weeks to months. They’re available over the counter in both sheet and gel form, making them one of the most accessible treatments for raised scarring.
Combining Treatments for Best Results
Most dermatologists take a multimodal approach, meaning they combine treatments rather than relying on just one. A typical plan for someone with mixed scar types might include TCA CROSS for ice pick scars, microneedling or laser resurfacing for boxcar and rolling scars, and a daily retinoid with sunscreen to support ongoing collagen remodeling between sessions. Fillers can address any remaining deep depressions after other treatments have done their work.
Improvement is cumulative. Professional treatments are spaced weeks apart to allow healing between sessions, and the full benefit of collagen remodeling continues for months after your last treatment. Mild scars may respond well to topical retinoids and microneedling alone. Deep or widespread scarring typically requires a combination of in-office procedures over six months to a year before reaching the best achievable result.