Keloid scars from acne are notoriously stubborn, but multiple treatments can significantly flatten them, reduce redness, and prevent new ones from forming. Unlike regular scars, keloids involve an overgrowth of thick, dense collagen that extends beyond the original acne lesion, which is why they don’t respond to typical scar creams or fade on their own. Getting rid of them usually requires a combination of professional treatments rather than any single approach.
Keloids vs. Raised Acne Scars
Not every raised acne scar is a keloid. Hypertrophic scars stay within the boundary of the original breakout and often improve over time. Keloids grow beyond the original wound edge and can continue expanding months or even years after the acne has healed. In some cases, they form without any obvious injury at all. Under a microscope, the difference is clear: hypertrophic scars contain fine, organized collagen fibers, while keloids are packed with large, thick, disorganized collagen bundles that make them firm and rubbery to the touch.
Acne keloids most commonly appear on the chest, shoulders, upper back, jawline, and neck. If you have darker skin, you’re at higher risk, and a family history of keloids makes them more likely. Knowing whether your raised scar is truly a keloid matters because it changes the treatment plan entirely. A dermatologist can usually tell by examining the scar’s shape, texture, and whether it has spread past where the pimple originally was.
Corticosteroid Injections: The First Step
For most people, treatment starts with steroid injections directly into the keloid. The standard approach uses a corticosteroid solution at concentrations tailored to the scar’s location and thickness. A dermatologist injects the solution into the keloid tissue every four to six weeks, typically over two to three sessions, though treatment can continue for six months or longer for stubborn scars. This approach flattens 50 to 100 percent of keloids over time.
The injections work by slowing collagen production and breaking down existing scar tissue. Each session takes just a few minutes, though the injection itself can sting. The most common side effect is thinning or lightening of the surrounding skin, which is why your provider will adjust the concentration based on where the keloid sits. Scars on delicate areas like the face receive a lower dose than those on the chest or back.
Laser Treatments for Redness and Flattening
Pulsed dye lasers target the blood vessels feeding the keloid, which reduces both redness and thickness. Clinical results show a single session can improve scar redness and height by about 57 percent, while two sessions push that improvement to roughly 83 percent. These lasers are particularly useful for acne keloids that are pink or red, since the laser energy is absorbed by the color in blood vessels.
Fractional lasers take a different approach, creating microscopic columns of controlled damage in the scar tissue to trigger the body’s remodeling process. These are often combined with steroid injections or other treatments rather than used alone. Laser treatments typically require multiple sessions spaced several weeks apart, and results build gradually. You can expect some redness and mild swelling for a few days after each session.
Stronger Injections for Resistant Keloids
When steroid injections alone don’t flatten a keloid enough, dermatologists can inject other medications directly into the scar tissue. One well-studied option is a chemotherapy agent used at very low doses. In a clinical study of 20 patients receiving weekly injections, 85 percent achieved more than 50 percent improvement in their keloids, with only one patient failing to respond. The tradeoff is more noticeable side effects: pain during injection is universal, temporary darkening of the skin is common, and some patients experience surface tissue breakdown at the injection site.
These stronger injections are typically reserved for keloids that haven’t responded to steroids after several months, or for larger scars where steroids alone would take too long to work. Your dermatologist may also combine them with steroid injections in alternating sessions to balance effectiveness against side effects.
Cryotherapy: Freezing the Scar Tissue
Cryotherapy destroys keloid tissue by freezing it from the inside out. The newer technique, intralesional cryotherapy, involves inserting a small probe directly into the keloid and delivering the freezing treatment internally. This produces dramatic results: in one clinical trial, scar volume dropped from an average of 460 cubic millimeters to under 19 cubic millimeters after a single session. By comparison, steroid injections required six sessions to achieve similar volume reduction.
Intralesional cryotherapy also has an advantage over traditional surface freezing when it comes to skin color changes. Surface cryotherapy causes lightening of the surrounding skin in over 90 percent of cases, which can be particularly noticeable on darker skin tones. The internal approach preserves more of the pigment-producing cells near the surface, making discoloration less likely. Sessions are repeated every four weeks for up to six rounds, depending on how the scar responds.
Silicone Sheets and Gels
Silicone products are the main at-home treatment for keloids and the only over-the-counter option with solid clinical backing. Silicone sheets are thin, flexible patches you place directly over the scar. They work by trapping moisture against the skin’s surface, which signals the body to slow collagen production.
The key with silicone is consistency. You need to build up tolerance gradually, starting at about four hours a day for the first couple of days, then increasing wear time as your skin adjusts. The recommended initial treatment period is 90 days, so this is not a quick fix. Silicone gels offer a more practical alternative for scars on the face or areas where a sheet won’t stay in place. Results are modest compared to injections or lasers, but silicone therapy works well as a complement to professional treatments and can help prevent keloids from worsening between sessions.
Why Surgery Alone Doesn’t Work
Cutting out a keloid seems like the most logical solution, but surgery by itself has a high failure rate. Over 51 percent of surgically removed keloids grow back when no follow-up treatment is used. The surgery itself creates a new wound, which triggers the same overactive healing response that caused the keloid in the first place. The regrown keloid is often larger than the original.
Surgery becomes a viable option only when paired with an adjuvant treatment that prevents regrowth. The most effective pairing is surgical excision followed by radiation therapy delivered within 48 hours. One large study of 238 patients treated with radiation after keloid removal found a recurrence rate of just 8.3 percent at 12 months. Steroid injections after surgery also reduce recurrence, though not as dramatically as radiation. For acne keloids, surgery is generally reserved for large, disfiguring scars that haven’t responded to less invasive treatments, since the stakes of recurrence are high.
Combining Treatments for Best Results
The most effective approach to acne keloids almost always involves layering multiple treatments. A common combination is steroid injections to flatten the bulk of the scar, followed by pulsed dye laser to address lingering redness and refine the texture. Silicone sheets between appointments help maintain progress and may enhance results from the professional treatments.
For newer, smaller acne keloids, steroid injections plus silicone therapy may be enough. For older, thicker scars, your dermatologist might start with cryotherapy or stronger injections to break down the densest tissue, then switch to lasers for refinement. The timeline varies widely. Some people see significant improvement in two to three months, while large or longstanding keloids can take a year or more of consistent treatment. Even after a keloid has flattened, ongoing monitoring matters, since these scars can reactivate if the area is irritated or re-injured.
Preventing new keloids is just as important as treating existing ones. If you’re keloid-prone, managing active acne aggressively reduces the chance of new scars forming. Avoid picking or squeezing breakouts, and talk to a dermatologist about acne treatment options that minimize inflammation before it has a chance to trigger that exaggerated healing response.