Keeping a wound moist, protected from the sun, and free from prolonged inflammation are the most effective ways to prevent or minimize scarring. In animal studies, wounds healing in a moist environment formed scars with significantly less width and surface area than wounds left to dry out, and the skin resurfaced twice as fast. Beyond moisture, several other factors, from nutrition to tension management, play meaningful roles in how your skin heals.
Why Scars Form in the First Place
Your body heals a wound in three overlapping phases: inflammation, proliferation, and remodeling. During inflammation, your immune system clears debris and fights infection. In the proliferation phase, new tissue fills the gap. During remodeling, which can last months or even years, your body reorganizes collagen fibers to strengthen the repair.
Scarring happens when any of these phases goes off track. The single biggest driver of excessive scarring is inflammation that drags on too long. When the inflammatory phase is prolonged or delayed, it disrupts everything downstream, pushing the wound toward fibrosis (dense, disorganized scar tissue) rather than normal healing. The fate of specialized cells called myofibroblasts during the remodeling phase ultimately determines whether a wound closes cleanly or develops a raised, thickened scar.
Keep the Wound Moist
The simplest, most well-supported thing you can do is never let a wound dry out and form a scab. In a pig model (pig skin closely resembles human skin), wounds treated with moist dressings resurfaced at twice the rate of wounds left to air dry. Dry wounds also developed dramatically more tissue death: 866 micrometers of necrosis at seven days compared to zero in the moist group.
Moist healing works because it creates an incubator-like environment where new skin cells can migrate across the wound surface without having to burrow beneath a hard, dry crust. The result is less inflammation, less tissue death, and measurably smaller scars. Dry wounds consistently produce wider scar tissue. You can maintain moisture with petroleum jelly, hydrocolloid bandages, or other occlusive dressings, reapplying after gentle cleaning.
Clean Gently, Skip Harsh Antiseptics
Your first instinct might be to douse a cut with hydrogen peroxide or rubbing alcohol, but aggressive antiseptics can damage healthy tissue and actually worsen scarring. Studies show that antiseptic solutions like povidone-iodine, hexachlorophene, and isopropyl alcohol provide no advantage over simple saline when it comes to preventing infection. Clean tap water performs just as well as sterile saline in clinical trials, with infection rates of 3.5% versus 6.4%, a difference that slightly favored tap water.
The goal of wound cleaning is to flush out debris and bacteria without harming the new cells trying to close the gap. Gentle irrigation with clean water or saline, rather than scrubbing with antiseptics, gives your skin the best starting conditions for minimal scarring.
Protect Healing Skin From the Sun
Fresh scars contain immature skin cells that are highly vulnerable to ultraviolet radiation. UV exposure on a healing wound increases the risk of hyperpigmentation, the dark discoloration that can make scars far more visible. In animal studies, UV exposure both before and after skin injury worsened scarring and slowed healing, producing deeper, more constricted wounds.
Cover healing wounds with clothing or a bandage when you’re outdoors. Once the wound has closed and you’re past the bandage stage, apply a broad-spectrum sunscreen with SPF 30 or higher to the area. Most dermatologists recommend maintaining diligent sun protection on a new scar for at least 12 months, since the skin remains more reactive to UV light throughout the remodeling phase.
Reduce Tension on the Wound
Mechanical tension is one of the strongest signals that tells your body to produce thick scar tissue. Surgeons plan incisions along the body’s natural relaxed tension lines (called Langer lines) specifically because cutting across these lines creates more prominent scars. For everyday wounds, the same principle applies: skin that is constantly being pulled apart heals with more scarring.
After surgery, several tools can reduce this tension. Paper tape (adhesive strips) placed along the wound edges provides gentle, sustained support. More advanced options include tension-offloading devices that shield the incision from the stretching forces of surrounding skin. For home care after a minor wound, butterfly bandages or wound closure strips can hold edges together and reduce the pulling force on new tissue. Avoid strenuous activity that stretches the area during the first several weeks of healing.
Silicone Gel and Sheets
Silicone is one of the most studied topical scar treatments. A meta-analysis of randomized controlled trials found that topical silicone gel significantly reduced scar height, pigmentation, and stiffness compared to no treatment or placebo. The effect on scar height was the most pronounced. Silicone works by maintaining hydration at the scar surface and possibly by regulating collagen production in the tissue beneath.
Silicone sheets are typically applied for 12 or more hours a day over several months. Silicone gels are easier to use on visible areas like the face because they dry into a thin, invisible film. Both are available over the counter. For best results, start using silicone once the wound has fully closed (no open or weeping areas), and continue for at least two to three months.
Onion Extract Gels
Over-the-counter scar gels containing onion extract (the active ingredient in products like Mederma) have some clinical support, though the effects are more modest than silicone. In a randomized controlled trial, scars treated with once-daily onion extract gel for eight weeks showed significantly better texture, softness, redness, and overall appearance compared to untreated scars. The differences became statistically significant after four weeks of use.
About 14% of participants experienced mild itching, burning, or stinging at the application site, but all cases resolved on their own. Onion extract gels are a reasonable, low-risk option to try, especially for minor scars where silicone sheets would be impractical.
Vitamin C and Nutrition
Your body cannot build normal collagen without adequate vitamin C. An analysis of historical trial data found that people consuming only about 10 mg of vitamin C per day (far below recommended levels) had 42% weaker scar tissue compared to those consuming 80 mg per day. Even more striking, people who had been vitamin C-depleted and then increased their intake to 65 mg daily still had 49% weaker scars than people who were never depleted, suggesting that restoring vitamin C after a deficiency takes time and higher doses.
The research indicates that daily intake in the range of 75 to 110 mg is needed to support normal collagen formation during wound healing. That’s easily achievable through diet: a single orange provides roughly 70 mg, and a cup of bell peppers provides over 100 mg. If you’re healing from a wound or surgery, ensuring adequate protein and zinc intake also matters, since both are essential building blocks for new tissue.
Early Laser Treatment for Surgical Scars
For surgical scars or wounds that appear to be developing raised, reddened tissue, pulsed dye laser treatment can significantly reduce pathological scar formation. A study on post-surgical scars found that initiating laser treatment within three weeks of surgery produced a 71% improvement in scar scores, compared to 60% improvement when treatment started between weeks four and six. That 11-point difference was statistically significant, and patients with the most pronounced early scarring benefited the most from immediate intervention.
Laser treatment works by targeting blood vessels in the scar tissue, reducing redness and the inflammatory signals that drive excessive collagen production. It’s not a DIY option, but if you have a surgical scar that is becoming raised, red, or firm in the first few weeks, asking a dermatologist about early laser intervention can meaningfully improve the final result.
What Matters Most, in Practical Terms
The interventions with the strongest evidence all share a common thread: they reduce inflammation, protect new tissue, and give your body the conditions it needs to remodel collagen in an orderly way. Keeping a wound moist and clean from day one has the largest impact and costs almost nothing. Adding silicone gel once the wound closes, protecting the area from sun, minimizing tension, and eating enough vitamin C stack additional benefits on top of that foundation. For scars that are already trending toward raised or discolored tissue, professional laser treatment within the first three weeks offers the best window for course correction.