Back acne scars are treatable, but the approach depends entirely on whether your scars are raised, indented, or simply discolored. The back is one of the most common places for thick, raised scarring to develop after acne, and it responds to different treatments than facial scars do. Getting visible improvement typically takes three to six months of consistent treatment, with deeper scars requiring staged correction over nine months or longer.
First, Identify What You’re Actually Dealing With
Not everything that looks like a scar is one. Flat, discolored spots left behind after a breakout are called post-inflammatory hyperpigmentation. These marks can be pink, red, brown, purple, or even black, but they’re flat against the skin with no change in texture. This is sometimes called “pseudo scarring” because it doesn’t involve actual tissue damage and will fade on its own over months, though certain treatments can speed that up.
True acne scars involve structural changes to the skin. On the back, you’re most likely dealing with one of two types:
- Hypertrophic or keloid scars: Raised, firm, thickened areas where the body overproduced collagen during healing. The back, chest, and shoulders are the most common locations for these. Keloids grow beyond the borders of the original wound, while hypertrophic scars stay within them.
- Atrophic (indented) scars: Depressed areas where tissue was lost during the healing process. These are less common on the back than on the face but can still occur after severe cystic acne.
Run your fingers over the area. If the marks are completely flat and smooth, you likely have pigmentation changes rather than true scars, and your treatment plan will be simpler. If you feel raised ridges or sunken pits, you’re dealing with structural scarring that needs a more targeted approach.
Treating Raised Scars on the Back
Raised scars are the signature challenge of back acne scarring, and they’re also the most stubborn. The standard first-line treatment is cortisone injections directly into the scar tissue. These work by breaking down the excess collagen that makes the scar thick and firm. You’ll typically need monthly injections for up to six months before the scar flattens noticeably. Possible side effects include thinning of the surrounding skin, visible small blood vessels, and permanent lightening or darkening of the injection site.
Silicone scar sheets are one of the most accessible at-home options for raised scars. They work by hydrating and compressing the scar tissue, which signals the body to slow collagen overproduction. For best results, wear the sheets for at least four hours per day and continue for a minimum of three months. Research in the Journal of Clinical and Aesthetic Dermatology found that extending use to six months helps prevent scars from re-thickening after treatment.
For larger or more resistant keloids, dermatologists often combine cortisone injections with laser therapy. Vascular lasers can reduce the redness and blood supply feeding a raised scar, while the injections handle the bulk. Flattening raised scars on the back almost always requires repeat treatments rather than a single session.
Treating Indented Scars
Depressed scars on the back respond to treatments that stimulate new collagen production beneath the skin’s surface. Microneedling is one of the most commonly used options. The procedure creates controlled micro-injuries that trigger the body’s repair process, gradually filling in the depression from below. A randomized trial comparing microneedling to 35% glycolic acid peels found both improved acne scarring, though combining microneedling with a glycolic acid peel produced better texture improvement than either treatment alone.
Chemical peels using glycolic acid or trichloroacetic acid (TCA) can also improve indented scars by removing damaged surface layers and prompting collagen remodeling underneath. For deeper individual scars, a technique called TCA CROSS applies concentrated acid directly into the base of each scar rather than across the whole surface. These are in-office procedures, and the back’s thicker skin often means a dermatologist will use higher concentrations than they would on the face.
Don’t expect quick results. New collagen forms gradually beneath the surface even after the skin looks healed on top. Many people notice their first meaningful texture changes around three months, with continued improvement through six months. Deep scars usually need a series of treatments spaced weeks apart, with the full course running three to nine months for most people.
What You Can Do at Home
Topical retinoids are the strongest home-use option for both indented scars and discoloration. They work by accelerating skin cell turnover and promoting the remodeling of collagen in the deeper layers of skin. Adapalene (available over the counter at 0.1%) is a good starting point because it tends to cause less irritation than prescription-strength alternatives. Prescription options like tretinoin and trifarotene can be applied to the trunk and are worth discussing with a dermatologist if over-the-counter options aren’t producing results after a few months.
For flat discoloration without texture changes, products containing ingredients that suppress excess pigment production can help. Look for formulas with azelaic acid, vitamin C, or niacinamide. These won’t restructure scar tissue, but they can fade dark marks significantly faster than waiting for them to resolve naturally. Apply sunscreen to exposed areas of the back during treatment, since many of these ingredients make skin more sensitive to UV light, which can darken pigmentation further.
Consistency matters more than intensity. Applying a retinoid every other night and building up to nightly use over several weeks will produce better long-term results than using a strong product aggressively and irritating the skin into inflammation, which can worsen discoloration.
Why Back Scars Are Harder to Treat
The skin on your back is significantly thicker than facial skin, which affects treatment in two ways. Topical products penetrate less efficiently, so they take longer to produce visible changes. And the back is one of the body’s high-tension zones, meaning the skin is constantly being stretched and pulled by movement, which creates mechanical stress on healing tissue. This is part of why the back, chest, and shoulders are so prone to hypertrophic and keloid scarring in the first place.
Individual biology plays a major role too. Some people are genetically predisposed to forming raised scars regardless of how they treat their acne. If you’ve noticed that cuts or injuries anywhere on your body tend to heal with thick, raised marks, you’re more likely to develop keloids on the back, and you should prioritize early treatment of active acne to prevent new scars from forming.
Combining Treatments for Better Results
Most dermatologists take a layered approach to back acne scarring rather than relying on a single treatment. A typical plan for someone with a mix of scar types might include cortisone injections for the most prominent raised scars, a series of microneedling sessions for indented areas, and a daily retinoid to improve overall skin texture and prevent new breakouts from creating additional scars.
If you still have active acne on your back, getting that under control is the first priority. Treating scars while new ones are forming is counterproductive. Once breakouts are managed, give your skin at least a few weeks to settle before starting scar-specific treatments. From there, expect the process to take months rather than weeks. The people who see the best outcomes are the ones who commit to a treatment plan and stick with it long enough for collagen remodeling to do its work, even when the first few weeks don’t show dramatic changes.