The most effective scar creams contain silicone, which is considered the gold standard for scar treatment in clinical guidelines. But “scar removal” is a bit of a misnomer. No cream fully erases a scar. The realistic goal is reducing its height, color, and stiffness so it blends more naturally with surrounding skin. Scar maturation takes 12 to 18 months, and the cream you choose matters less than using it consistently over that window.
Silicone Gel: The Best-Supported Option
Silicone-based gels and sheets have the strongest clinical evidence behind them. A systematic review of randomized controlled trials found that topical silicone gel significantly reduced scar pigmentation, height, and stiffness compared to no treatment, with measurable improvements at six to eight months of follow-up. The effect on scar height was the most pronounced of the three.
Silicone works by forming a breathable, water-resistant layer over the scar that locks in moisture and regulates collagen production. Scars form when your body overproduces collagen during healing. By keeping the skin hydrated and protected, silicone helps that collagen remodel into a flatter, softer arrangement over time. Products come in two main forms: a gel you apply like a lotion and adhesive sheets you wear directly on the scar. Both work, though sheets provide the added benefit of gentle pressure, which independently helps flatten raised scars. Newer cohesive silicone bandages combine both occlusion and pressure, and early data suggests they may improve scar elasticity more than sheets alone.
For silicone sheets, the standard recommendation is to wear them at least 12 hours per day for three to four months, with a maximum treatment duration of six months. Longer use can actually interfere with healing. Silicone gels are typically applied twice daily and are easier to use on visible areas like the face or hands where wearing a sheet would be impractical.
Onion Extract Gels
Onion extract is the active ingredient in Mederma, one of the most widely purchased scar products. Clinical trials show it does improve scar texture and redness compared to untreated scars, with statistically significant differences appearing after about four weeks of daily application. After eight weeks, investigators rated treated scars notably better in both texture and redness than control scars.
The catch is that onion extract has not been shown to outperform silicone in head-to-head comparisons. It’s a reasonable option if you want something affordable and easy to apply, but it’s not the strongest performer. The original formula requires application two to three times daily, while a newer advanced version uses a higher concentration and needs only once-daily use.
Centella Asiatica (Cica) Creams
Centella asiatica, the plant behind the “cica” trend in skincare, has genuine scar-healing properties. Its active compounds promote collagen production while simultaneously reducing the signals that cause excessive scarring. In a double-blind trial, a Centella cream improved overall scar appearance within four weeks and showed significant pigmentation improvement by eight weeks compared to placebo.
What makes Centella interesting is its dual action. It stimulates production of type I collagen (the kind that strengthens and matures new skin) while slowing the overactive scarring response driven by growth factors that cause raised, thick scars. It also inhibits the migration of cells associated with keloid formation. You’ll find Centella in many Korean skincare products and dedicated scar treatments. It’s a solid botanical option, though the evidence base is still smaller than what exists for silicone.
Vitamin E: Skip It
Despite its popularity, topical vitamin E does not improve scar appearance. In a controlled study of surgical scars, 90% of patients who applied vitamin E saw either no benefit or a worsening of their scar’s appearance. One-third of participants developed contact dermatitis, an itchy, inflamed skin reaction, from the vitamin E itself. This is one of the clearest cases where a widely believed home remedy is directly contradicted by clinical data.
Retinoids for Acne Scars
If your scars are the pitted, indented kind left behind by acne, the treatment calculus changes. Those atrophic scars respond to a different class of ingredient: retinoids. These vitamin A derivatives push your skin cells to turn over faster and stimulate the deeper skin layers to produce new collagen, which gradually fills in depressed scars from below.
A large-scale clinical trial found that a prescription retinoid cream (trifarotene 0.005%) reduced total atrophic acne scar count by 55% over 24 weeks, compared to 30% with a placebo cream. Improvements were detectable as early as two weeks. Other retinoids like adapalene and tretinoin (0.05%) have also shown meaningful scar improvement over four to six months of daily use, though the effect is most pronounced on shallow, superficial scars. Deeper ice-pick scars generally need in-office procedures rather than topical treatment alone.
When and How to Start Treatment
Timing matters. You should not apply scar cream to an open or partially healed wound. If your incision was closed with absorbable sutures and adhesive strips, you can typically begin scar treatment about two weeks after the strips are removed, provided the skin is fully closed. If you had non-dissolving stitches, treatment starts after suture removal.
Once you begin, consistency is more important than product choice. Apply your chosen product daily (or twice daily, depending on the formulation) and plan for months of use, not weeks. Most clinical trials showing significant improvement ran for at least eight to twelve weeks, and scar remodeling continues for up to 18 months after the original injury. Starting treatment early in that window gives you the best chance of influencing the final result.
Sunscreen Is Non-Negotiable
Whatever cream you use, pair it with broad-spectrum sunscreen of SPF 30 or higher on any scar that’s exposed to daylight. Scar tissue lacks the normal levels of melanin that protect healthy skin from UV damage, making it especially prone to darkening or developing permanent discoloration. This protection should continue for 12 to 18 months after the wound closes, covering the full maturation period. Even brief, incidental sun exposure can undo weeks of progress from your scar cream.
Realistic Expectations
No topical product will make a scar disappear. What the best options can do is flatten a raised scar, fade its color closer to your natural skin tone, and soften its texture so it feels less rigid. Silicone gels offer the strongest evidence across all three of those outcomes. Onion extract and Centella creams provide moderate improvement and are reasonable if silicone doesn’t suit you. For pitted acne scars, retinoids are the most effective topical route, ideally prescribed by a dermatologist who can match the concentration to your skin type.
If a scar hasn’t responded to several months of consistent topical treatment, the next step is typically an in-office procedure like laser therapy, microneedling, or steroid injections for raised scars. Topical creams work best on newer scars that are still actively remodeling. The older and more established a scar is, the less any cream can change it.