What you put on acne scars depends on whether you’re dealing with dark marks, indented scars, or raised scars, because each type responds to different ingredients. Most people searching for help with “acne scars” actually have a mix of flat discoloration and textural changes, and the good news is that several over-the-counter ingredients can make a real difference before you ever consider a clinic visit.
Dark Marks vs. True Scars
The flat, discolored spots left behind after a breakout aren’t technically scars. They’re called post-inflammatory hyperpigmentation (PIH), and they’re caused by excess pigment deposited in the skin during the healing process. They’re completely flat to the touch. True acne scars, by contrast, involve structural changes: either a loss of tissue that creates a pit or depression, or an overgrowth of tissue that forms a raised bump. This distinction matters because pigment-fading ingredients won’t fill in a depressed scar, and collagen-boosting treatments won’t erase a dark spot any faster than a targeted brightening ingredient would.
If you run your finger over the area and it feels smooth, you’re dealing with pigmentation. If you can feel a dip or a bump, that’s a true scar. Many people have both at the same time.
Best Ingredients for Dark Spots
Glycolic acid is a strong starting point for fading post-acne marks. It speeds up the skin’s natural exfoliation cycle, pushing pigmented cells to the surface faster so fresh skin can replace them. You’ll find it in toners, serums, and peels at concentrations ranging from about 5% to 10% for daily home use.
Vitamin C serums (typically as L-ascorbic acid at 10% to 20%) work by interrupting pigment production and providing antioxidant protection. Niacinamide, usually at 5%, reduces the transfer of pigment to skin cells and calms residual redness. Azelaic acid at 15% has direct activity against the enzyme that produces melanin, and a pilot study published in the Journal of Drugs in Dermatology confirmed that twice-daily application reduced both active acne and the dark marks left behind. It also has anti-inflammatory properties, making it particularly useful if your spots are still pink or reddish.
For stubborn pigmentation that doesn’t budge after a few months of over-the-counter treatment, dermatologists sometimes prescribe hydroquinone, which blocks melanin production more aggressively. It’s often combined with tretinoin and sometimes kojic acid to enhance results. These prescription combinations tend to show visible fading within 8 to 12 weeks.
Topical Treatments for Depressed Scars
Depressed (atrophic) scars come in three shapes. Ice pick scars are narrow, deep, and V-shaped. Boxcar scars are wider with sharp, defined edges. Rolling scars have sloping borders that give skin a wavy, uneven texture. All three result from collagen loss during the healing process, so treatments that stimulate new collagen production are the primary approach.
Retinoids are the most evidence-backed topical option. Tretinoin strongly stimulates the production of collagen types I and III, and it improves the organization of newly formed collagen bundles, which helps fill in depressions over time. One clinical study found that 79% of patients saw flattening of atrophic scars after a treatment protocol using 0.05% tretinoin gel. Over-the-counter retinol works through the same pathway but is weaker; prescription tretinoin or adapalene at 0.3% delivers more noticeable results. Adapalene improved skin texture by one to two grades in about 56% of patients over 24 weeks in one trial.
The key with retinoids is patience. Collagen remodeling is slow. Expect to use a retinoid consistently for at least three to six months before judging whether it’s working. Start with every other night to let your skin adjust, then increase to nightly use.
What to Put on Raised Scars
Raised scars fall into two categories. Hypertrophic scars stay within the boundaries of the original breakout. Keloid scars grow beyond the original spot and can continue expanding. Both form when the body overproduces scar tissue during healing.
Silicone gel sheets and silicone-based scar gels are the first-line home treatment for raised scars. They work by mimicking the skin’s natural barrier and locking in moisture. This hydration effect is believed to regulate the signaling molecules that drive excess collagen production, effectively telling the scar tissue to slow down. Research published in the Journal of Clinical and Aesthetic Dermatology found that silicone sheeting reduces a specific protein (fibronectin) involved in scar overgrowth. For best results, wear silicone sheets for at least 12 hours a day over several months.
Why Sunscreen Is Non-Negotiable
Scar tissue lacks the normal levels of melanin that protect healthy skin from UV damage. Sun exposure can darken post-acne marks and make them more persistent, and it breaks down collagen and elastin, which are exactly the proteins you’re trying to rebuild in depressed scars. Broad-spectrum sunscreen with SPF 30 or higher, applied daily, protects new collagen formation and prevents pigmentation from worsening. This single step makes every other product in your routine more effective.
Professional Treatments Worth Knowing About
Over-the-counter products can improve mild scarring and pigmentation, but moderate to severe scars often need professional intervention. Here’s what those options look like in practice.
Microneedling
A device creates tiny punctures in the skin using needles typically 1.5 to 2.0 mm long for acne scars. This controlled injury triggers a wound-healing response that produces new collagen. Sessions are spaced at least three weeks apart, and a 2025 review found that three months of treatment led to improvements in scar depth and facial texture. Most people need three to six sessions. Downtime is minimal: redness and mild swelling for a day or two.
Fractional CO2 Laser
This laser treats a fraction of the skin’s surface at a time, creating tiny columns of injury surrounded by healthy tissue. The healthy tissue speeds recovery. Healing takes one to two weeks, during which skin forms a crust that gradually falls away. It’s one of the more aggressive options, but it can produce significant improvement in a single session for deeper scars.
TCA CROSS for Ice Pick Scars
Ice pick scars are notoriously difficult to treat because of their narrow, deep shape. The TCA CROSS technique uses a high concentration (70% to 100%) of trichloroacetic acid applied directly into each individual scar. This triggers a focused inflammatory response that generates new collagen fibers from the bottom of the scar upward, gradually raising the depression. Multiple sessions are typically needed, spaced four to six weeks apart.
Chemical Peels
Professional-strength peels using glycolic acid or trichloroacetic acid at higher concentrations than home products can address both pigmentation and shallow scarring. They remove damaged surface layers and stimulate collagen production in deeper skin. Recovery ranges from a day of mild flaking for lighter peels to a week of peeling for medium-depth ones.
Building a Practical Routine
For dark marks with no texture change, a morning routine of vitamin C serum followed by SPF 30+ sunscreen, and an evening routine with glycolic acid or azelaic acid, covers the essentials. You should see noticeable fading within two to three months.
For depressed scars, add a retinoid to your evening routine (alternate nights with your acid, or use the retinoid nightly and the acid two to three times per week). Give it at least three to six months. If improvement plateaus, that’s a reasonable time to explore microneedling or laser treatments with a dermatologist.
For raised scars, apply silicone gel or sheets daily and consistently for at least two to three months. If the scar doesn’t flatten, dermatologists can offer steroid injections or laser treatments designed specifically for raised tissue.
Layering too many active ingredients at once increases irritation without speeding results. Pick one brightening ingredient and one collagen-stimulating ingredient, use sunscreen, and stay consistent. Scar treatment is measured in months, not days.