Acne scars are permanent skin texture changes caused by inflammation that destroys collagen during a breakout, but they are also treatable with effective professional options like microneedling, chemical peels, microdermabrasion, dermal fillers, and growth factor injections.
Most acne scars require active treatment and do not resolve on their own, which makes it essential to rebuild the damaged collagen structure beneath the skin.
This guide covers every evidence-based treatment for acne scars, ranks them by scar type, and provides a clear results timeline for each. Green Relief Health treats acne scars in Baltimore using a combination of microneedling, chemical peels, and fillers, selected specifically for each patient’s scar type and skin tone.
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Book a Skin Consultation- The 4 Types of Acne Scars
- 5 Professional Treatments That Remove Acne Scars
- Microneedling
- Chemical Peels
- Microdermabrasion
- Dermal Fillers
- Natural Growth Factor Injections
- Which Treatment Matches Which Scar Type
- Best Treatment Combinations by Scar Profile
- Results Timeline for Acne Scar Treatments
- Final Thoughts
- Frequently Asked Questions
The 4 Types of Acne Scars
Acne scars are permanent skin texture or pigment changes caused by the destruction of collagen and elastin during an inflamed breakout. Identifying scar type is the first step, because each type responds to different treatments, and using the wrong treatment produces no improvement.
| Scar Type | Appearance | Cause | Depth |
|---|---|---|---|
| Ice Pick | Deep, narrow holes in the skin | Infection destroys the deep tissue column | Deep dermis |
| Boxcar | Wide box-shaped depressions with sharp edges | Loss of collagen in a defined area | Shallow to mid dermis |
| Rolling | Wave-like undulations across the skin surface | Fibrous tissue pulls the dermis downward | Mid dermis |
| PIH (dark spots) | Flat dark spots: brown, red, or purple | Excess melanin deposited after inflammation | Surface (epidermis) |
5 Professional Treatments That Remove Acne Scars
Professional acne scar treatments work by stimulating collagen production, resurfacing the skin, or restoring volume. Since no single treatment works for all scars, a personalized combination approach tailored to your specific scar types delivers the best results.
Treat Active Acne First: Controlling active acne before scar treatment is essential. It prevents new scars and prepares your skin for effective procedures like microneedling, chemical peels, and growth factor injections.
Microneedling for Acne Scars
Microneedling is a collagen induction therapy that uses a device with 12 to 36 fine needles to create controlled micro-injuries in the dermis. Each micro-injury triggers the skin’s natural wound-healing response, releasing growth factors and stimulating fibroblasts to produce new collagen and elastin. This new collagen fills in depressed scar tissue from below.
- Best for: rolling scars, boxcar scars, and shallow ice pick scars.
- Average improvement: 50 to 70% reduction in scar depth after a full treatment course.
- Needle depth: 0.5 mm to 2.5 mm, depending on scar depth.
- Session spacing: 4 to 6 weeks between sessions to allow full collagen remodeling.
- Downtime: 24 to 72 hours of redness and mild swelling.
- Skin tones: safe for all skin tones, including darker complexions (Fitzpatrick IV-VI).
Microneedling produces cumulative improvement with each session. Results from the first session appear at 4 to 6 weeks as new collagen matures. The full benefit of a 3-session course typically appears at 3 months post-treatment, with deeper scars requiring all 6 sessions for maximum results. Patients can review microneedling before-and-after photos at Green Relief Health to evaluate realistic outcomes for their scar type.
Chemical Peels for Acne Scars
A chemical peel is a controlled skin resurfacing treatment that applies an acid solution (glycolic, salicylic, lactic, or trichloroacetic acid) to remove damaged outer skin layers and stimulate new cell turnover. As treated skin peels away over 3 to 7 days, it is replaced by fresher skin with less visible scarring and more even pigmentation.
- Superficial peels (glycolic acid 20-35%, salicylic acid): target PIH and very shallow scarring. 4 to 6 sessions spaced 2 to 4 weeks apart. No downtime.
- Medium-depth peels (TCA 20-35%, Jessner’s): target shallow boxcar and rolling scars alongside PIH. 3 to 4 sessions. 3 to 5 days of visible peeling.
- Deep peels (TCA 50%+, phenol): target deep boxcar scars. Single session. 7 to 14 days of significant downtime.
Chemical peels achieve a 40 to 60% improvement in shallow atrophic scars and near-complete resolution of PIH in most patients after 3 to 6 sessions. Superficial peels are the safest option for all skin tones. Green Relief Health offers chemical peels in Baltimore with peel strength customized to skin tone, scar depth, and treatment goals.
- Apply SPF 30 or higher every day: sun exposure on freshly treated skin darkens PIH and reverses improvement.
- Do not pick peeling skin: premature removal disrupts new cell formation and creates new post-inflammatory marks.
- Avoid retinoids for 7 days after peeling: combining active exfoliants with a recovering skin barrier causes irritation.
- Use a gentle, fragrance-free moisturizer: hydration accelerates healing and reduces redness duration.
- Skip intense exercise for 48 hours: heat and sweat irritate freshly treated skin and prolong redness.
Microdermabrasion for Acne Scars
Microdermabrasion is a mechanical exfoliation treatment that uses a diamond-tipped wand or fine crystal spray to remove the outermost layer of dead skin cells. It improves the appearance of very shallow acne scars, post-inflammatory hyperpigmentation, and uneven skin texture by accelerating natural skin cell turnover.
- Best for: PIH, very shallow boxcar scars, and overall skin texture improvement.
- Improvement: 20 to 40% improvement in surface-level scarring and discoloration.
- Limitation: does not reach the dermis, so it has no effect on deep ice pick or deep boxcar scars.
- Downtime: none; skin appears slightly pink for 24 hours after treatment.
- Session frequency: every 2 to 4 weeks.
Microdermabrasion is most effective as a maintenance treatment between deeper procedures or for patients with mild surface-level scarring. At Green Relief Health in Baltimore it is often paired with chemical peels to address surface discoloration and texture simultaneously.
Dermal Fillers for Acne Scars
Dermal fillers are injectable hyaluronic acid or poly-L-lactic acid gels placed beneath depressed scar tissue to immediately lift rolling and boxcar scars to the level of the surrounding skin. Fillers restore volume to the hollow space created by collagen loss, producing instant visible improvement that no other scar treatment matches for speed.
- Best for: rolling scars and wide boxcar scars with soft walls.
- Not effective for: ice pick scars (too narrow and deep) and PIH (flat discoloration).
- Onset: immediate, with results visible within minutes of injection.
- Duration: 6 to 18 months, depending on filler type and injection location.
- Sessions needed: 1 initial session, with a touch-up at 6 to 12 months.
Many patients combine fillers for immediate improvement with microneedling for long-term collagen rebuilding. Green Relief Health’s guide on fillers for acne scars covers which filler types work best for each scar shape and depth.
Natural Growth Factor Injections for Acne Scars
Natural growth factor injections, also called PRP (platelet-rich plasma) therapy, use concentrated platelets drawn from the patient’s own blood and injected directly into scar tissue to release growth factors that accelerate collagen production and tissue repair. Because the treatment uses the patient’s own biological material, the risk of allergic reaction is near zero.
- Best for: rolling scars, boxcar scars, and overall skin quality improvement.
- Mechanism: PDGF and TGF-β accelerate fibroblast activity for collagen repair.
- Results timeline: visible improvement at 4 to 6 weeks; full results at 3 to 6 months.
- Combination advantage: 25 to 35% greater improvement when combined with microneedling.
- Sessions: 3 to 4 sessions spaced 4 to 6 weeks apart.
Clinical studies show that combining natural growth factor injections with microneedling produces 25 to 35% greater scar improvement than microneedling alone. This combination is particularly effective for patients with multiple rolling and boxcar scars covering a large area of the cheeks or jawline.
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Most patients see 50 to 70% improvement with the right treatment combination. Find out what will work best for your scars.
Book a Skin ConsultationWhich Treatment Matches Which Scar Type
Matching the correct treatment to each specific scar type determines the outcome. The table below shows treatment effectiveness for each acne scar type.
| Treatment | Ice Pick | Boxcar | Rolling | PIH |
|---|---|---|---|---|
| Microneedling | Moderate | High | High | Moderate |
| Chemical Peel | Low | Moderate | Moderate | High |
| Microdermabrasion | Low | Low | Low | Moderate |
| Dermal Fillers | Not Rec. | High (wide scars) | High | Not Rec. |
| Growth Factor Injections | Low | High | High | Moderate |
New acne breakouts create new scars, so controlling the source of breakouts is essential alongside scar treatment. Stress-triggered acne is one of the most common causes of continued breakouts in adults, and scar treatments work best when active acne is under control first.
Best Treatment Combinations by Scar Profile
The most effective acne scar plans pair treatments that work at different skin depths. Here are the combinations matched to common scar profiles:
- Rolling + boxcar scars: microneedling (3-6 sessions) plus natural growth factor injections, for progressive collagen rebuilding from below.
- PIH only (flat dark spots): superficial chemical peels (4-6 sessions) plus daily SPF 30, for the fastest resolution of pigment changes.
- Mixed (depressed scars + PIH): microneedling and a medium-depth chemical peel alternated every 4 weeks, to address both structural damage and pigmentation.
- Deep boxcar + rolling (immediate correction): dermal fillers for instant lift plus microneedling for long-term collagen rebuilding.
- Surface texture + mild PIH: a microdermabrasion series (6-10 sessions), a no-downtime option for mild surface-level improvement.
Results Timeline for Acne Scar Treatments
Acne scar treatments require patience, because collagen remodeling is a biological process that takes weeks to months. The results timeline varies by treatment type and scar depth.
| Treatment | First Results Visible | Full Results | Maintenance |
|---|---|---|---|
| Microneedling | 4-6 weeks after session 1 | 3-6 months (full course) | 1-2 sessions/year |
| Chemical Peel | 2-3 weeks after session 1 | 2-4 months (full course) | Seasonal (every 3-4 months) |
| Microdermabrasion | After session 2-3 | 3-5 months (full course) | Monthly |
| Dermal Fillers | Immediate (same session) | Immediate | Every 6-18 months |
| Growth Factor Injections | 4-6 weeks after session 1 | 3-6 months (full course) | 1-2 sessions/year |
Find Out Which Acne Scar Treatment Is Right for You
Green Relief Health’s providers assess your specific scar types and recommend the most effective treatment combination for your skin tone and scar depth.
Book a Skin ConsultationFinal Thoughts
Getting rid of acne scars requires matching the right treatment to the right scar type. Atrophic scars (ice pick, boxcar, and rolling) require treatments that rebuild dermal collagen: microneedling, medium-depth chemical peels, and natural growth factor injections. Post-inflammatory hyperpigmentation (flat dark spots) responds fastest to superficial chemical peels and consistent SPF use.
Combining treatments produces superior results to single-modality treatment. Microneedling with growth factor injections outperforms either treatment alone by 25 to 35%. Dermal fillers provide immediate structural correction for rolling and boxcar scars while microneedling builds long-term collagen improvement underneath. Patients can compare options in the detailed microneedling vs chemical peels guide at Green Relief Health.
Active acne must be controlled before beginning scar treatment, because each new breakout creates new scar risk. Treatment results last longer and require fewer maintenance sessions when the underlying breakout cycle is addressed alongside the scarring it has already produced.
Related Resources
Frequently Asked Questions
Dermal fillers produce the fastest visible improvement, with results appearing immediately during the injection appointment. For patients with rolling or boxcar scars, fillers physically lift the depressed tissue back to skin level within minutes. For pigmented scars (PIH), superficial chemical peels show visible improvement in 2 to 3 weeks. No treatment produces overnight results for deep atrophic scars; those require collagen rebuilding over 3 to 6 months of treatment.
Microneedling produces permanent collagen improvement, and the new collagen built during treatment does not disappear after the treatment ends. However, microneedling does not completely erase scars; it reduces their depth and visibility by 50 to 70%. Results are long-lasting and require only 1 to 2 annual maintenance sessions to sustain. The collagen changes induced by microneedling continue to mature for up to 6 months after the final session.
Most patients with moderate rolling and boxcar scars need 3 to 6 microneedling sessions to achieve 50 to 70% improvement. Shallow scars respond in 3 sessions, while deep boxcar scars require the full 6-session course. Sessions are spaced 4 to 6 weeks apart to allow complete collagen remodeling between treatments. Combining microneedling with natural growth factor injections reduces the number of sessions needed by accelerating collagen repair.
Yes. PIH (flat dark spots) and atrophic scars (depressed pits) require completely different treatments. PIH responds to chemical peels, topical vitamin C, niacinamide, azelaic acid, and consistent SPF use. Depressed scars require collagen-stimulating treatments such as microneedling, growth factor injections, chemical peels, or fillers for structural correction. Most patients have a combination of both PIH and atrophic scarring from the same breakouts.
Microneedling and superficial chemical peels are safe for all skin tones, including Fitzpatrick IV-VI. Microneedling does not use heat or light, which eliminates the hyperpigmentation risk that laser treatments pose for darker skin. Medium-depth and deep chemical peels require extra caution in darker skin tones, where an experienced provider adjusts acid strength and monitoring protocols to minimize post-inflammatory pigmentation. Dermal fillers and growth factor injections carry no skin tone restrictions.
Microneedling produces better results for structural atrophic scars (rolling, boxcar) because it rebuilds collagen in the dermis. Chemical peels produce better results for PIH and surface texture irregularity. The two treatments target different skin layers and work synergistically. The microneedling vs chemical peel for acne scars guide provides a detailed comparison for patients deciding between the two approaches.
PIH (flat dark marks) fades on its own over 3 to 24 months with consistent sun protection. Atrophic scars (ice pick, boxcar, rolling) do not self-resolve; they represent permanent structural collagen loss that the body does not regenerate without therapeutic stimulation. Starting collagen-stimulating treatment within 6 to 12 months of scar formation results in faster, more complete improvement than treating older, fully established scars.
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