Acne scars can be significantly improved with the right combination of treatments, but the approach depends entirely on what type of scar you’re dealing with. Depressed scars, raised scars, and dark marks left behind after breakouts each respond to different strategies. Most people see meaningful improvement within a few months of starting treatment, with full results taking up to a year as your skin rebuilds collagen from the inside out.
Identify Your Scar Type First
Not all acne scars are the same, and treating the wrong type with the wrong method wastes time and money. Acne scars fall into two broad camps: atrophic (indented) and hypertrophic (raised). Most acne scars are atrophic, meaning the skin lost tissue during healing and left behind a depression. Within that category, there are three distinct shapes.
Ice pick scars are small, narrow indentations that point down into the skin like a tiny puncture. They’re often the hardest to treat because of their depth relative to their size. Boxcar scars are broader depressions with sharply defined, box-like edges. Rolling scars vary in depth and have sloping edges that make the skin look wavy and uneven. Many people have a mix of all three.
Raised scars, including hypertrophic scars and keloids, happen when the body overproduces collagen during healing. These are more common on the jawline, chest, and back. Keloids grow beyond the original wound boundary and can be particularly stubborn.
There’s also a category that isn’t technically scarring at all: post-inflammatory hyperpigmentation, the flat dark or reddish marks left behind after a pimple heals. These fade on their own over time but can linger for months without treatment.
What Topical Treatments Can Do
Topical treatments work best for shallow scars and discoloration. They won’t erase deep ice pick or boxcar scars, but they can meaningfully improve skin texture and tone over several months of consistent use.
Retinoids are the strongest topical option. They work by stimulating collagen production in the deeper layers of skin and reducing the enzymes that break collagen down during inflammation. This addresses the persistent tissue loss that creates depressed scars. Retinoids also have depigmenting properties, making them useful for fading dark marks left by acne. Over-the-counter retinol is milder; prescription-strength retinoids work faster but cause more irritation during the adjustment period.
Vitamin C serums act as antioxidants that support collagen synthesis and help fade hyperpigmentation. Alpha hydroxy acids like glycolic acid speed up cell turnover on the skin’s surface, which gradually smooths shallow texture irregularities. These ingredients work well alongside retinoids but should be introduced slowly to avoid irritation. Consistency matters more than potency: steady daily use over two to three months produces better results than aggressive short-term application.
Professional Treatments for Depressed Scars
Deeper scars typically need professional intervention. The most effective options work by creating controlled injury in the skin, triggering your body’s wound-healing response and prompting new collagen to fill in depressions from beneath.
Laser Resurfacing
Ablative lasers are the most powerful resurfacing tools available. They vaporize the top layers of skin by targeting water in skin cells with concentrated light energy, destroying damaged tissue and forcing the skin to rebuild. CO2 lasers penetrate deepest and produce the most dramatic results, but they require two to four weeks of healing. Erbium lasers create shallower wounds with less heat damage to surrounding tissue, so recovery is shorter.
Non-ablative lasers leave the skin’s surface intact while stimulating collagen changes in deeper layers. They produce more moderate results but involve far less downtime, making them a practical choice if you can’t take weeks off for recovery. Most people need multiple non-ablative sessions spaced weeks apart.
Microneedling
Professional microneedling uses a motorized pen-shaped device with fine needles that penetrate the skin to reach living tissue, nerves, and blood vessels. This controlled puncturing triggers collagen production without removing skin. It works well for rolling scars and moderate boxcar scars. Multiple sessions, typically three to six spaced four to six weeks apart, are needed for noticeable improvement.
At-home microneedling devices are a different category entirely. The FDA distinguishes between devices with short, blunt needles that only exfoliate the outermost dead skin layer and professional devices that actually penetrate living tissue. Home rollers with short needles can help with product absorption and mild exfoliation, but they don’t reach the depth needed to stimulate real collagen remodeling. If you do use a home device, clean it between uses as directed by the manufacturer and never share it with anyone else, as reusing or sharing needles risks infection.
Subcision
Rolling scars often look worse than they are because scar tissue has formed web-like connections pulling the skin surface down toward deeper tissue. Subcision releases these tethered scars by inserting a needle beneath the skin and physically breaking those fibrous bands. Once the scar is freed, it lifts back up toward the surface. The scraping action under the skin also stimulates new collagen formation, which helps raise the scar further over time. Subcision is frequently combined with other treatments like fillers or microneedling for better results.
Chemical Reconstruction for Ice Pick Scars
Ice pick scars are too narrow and deep for most surface-level treatments to reach. A targeted technique called TCA CROSS deposits a small amount of trichloroacetic acid at high concentration (70 to 100 percent) directly into the base of each individual scar. This causes controlled destruction of scar tissue deep within the pore, prompting the body to rebuild with new collagen from the bottom up. Multiple sessions are usually needed, and this is strictly a clinical procedure due to the acid concentration involved.
Dermal Fillers
Injectable fillers can immediately raise depressed scars by adding volume beneath them. This works especially well for rolling and boxcar scars. Some fillers are temporary and need periodic touch-ups, while others stimulate your own collagen production for longer-lasting improvement. Fillers are often paired with subcision: the filler holds the scar up while the released tissue heals in its new position.
Treating Raised Scars
Hypertrophic scars and keloids require a fundamentally different approach since the problem is excess tissue rather than missing tissue. Silicone gel sheeting is considered a first-line treatment for both. An international advisory panel concluded it’s a viable option for hypertrophic scars, immature keloids, and mature keloids. It won’t completely resolve keloids, but it modulates scar formation and can reduce thickness. The recommended regimen is wearing the sheeting for at least 12 hours a day over two to three months. Silicone sheets have very few side effects and can also be used preventively if you know you’re prone to raised scarring.
For more resistant raised scars, corticosteroid injections are the most commonly used treatment. The steroid is injected directly into the scar tissue to soften and flatten it. Multiple sessions are often needed depending on the scar’s size and thickness. Side effects are relatively common, occurring in up to 63 percent of treated areas, and can include skin thinning, visible blood vessels, and permanent lightening of the skin at the injection site. Combining corticosteroid injections with cryotherapy (freezing) appears to be the most effective approach for preventing keloid recurrence.
How Long Results Take
One of the biggest sources of frustration with scar treatment is the timeline. Your skin doesn’t rebuild overnight, and the biological process of collagen remodeling follows a predictable but slow schedule.
After a professional treatment like laser resurfacing or microneedling, collagen synthesis begins within the first week in the deeper layers of skin. During weeks two through four, active remodeling reshapes the dermal tissue, and you may notice initial texture smoothing. Meaningful scar reduction becomes visible after two to three months, as new collagen actively fills in depressed scars from beneath. Collagen remodeling reaches its peak between three and six months, and final maturation continues through the six-to-twelve-month mark.
This means the results you see at your one-month follow-up are only a fraction of what you’ll eventually get. Planning treatment timing around this reality helps set expectations: if you want noticeable improvement for a specific date, start at least six months before.
Combining Treatments for Better Results
Most dermatologists use a multi-modal approach for acne scarring because different scar types on the same face respond to different techniques. A typical treatment plan might involve subcision for tethered rolling scars, TCA CROSS for scattered ice pick scars, and laser resurfacing or microneedling for overall texture. Topical retinoids are often used between sessions to support ongoing collagen production and prevent new scarring from active breakouts.
The order and spacing of treatments matters. Active acne should be controlled before starting scar treatment, since ongoing breakouts create new damage that undermines the healing process. Sessions are generally spaced four to eight weeks apart to allow adequate collagen remodeling between treatments. A full course of treatment for moderate-to-severe scarring often spans six to twelve months, with continued improvement for months after the last session.