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A practical guide to acne scar treatment — different scar types, which treatments work for which type, realistic outcomes, and how to structure a treatment plan.
· By MedSpot Editorial · 5 min read
Acne scars are not one thing. "Acne scarring" describes several distinct types of tissue damage, and what works for one type may not work for another. Understanding your scar type is the most important first step in building a treatment plan.
Atrophic scars form when the skin loses collagen during healing. There are three main subtypes:
Ice pick: Deep, narrow channels (like a puncture). The hardest to treat because the scar extends into the deep dermis. Width: <2 mm.
Boxcar: Wider, flat-bottomed depressions with sharp, defined edges. Easier to treat than ice pick. Width: 1.5–4 mm.
Rolling: Shallow, undulating depressions with sloped edges — caused by fibrous bands that tether the skin downward. Often the most responsive to treatment.
Hypertrophic scars are raised but stay within the original wound boundary. Keloids grow beyond the wound boundary. Both result from excessive collagen production during healing.
These are more common on the chest, back, and shoulders. They require different treatments than atrophic scars.
PIH is dark discoloration after acne heals — this is not technically scarring (it's a pigmentation change, not a structural change). It often fades on its own over months. Many patients confuse PIH with scars; they require different treatments.
RF microneedling is one of the most effective treatments for atrophic scars — particularly boxcar and rolling scars. The combination of physical collagen disruption (needles) and thermal energy (RF) stimulates significant collagen remodeling.
Best for: Boxcar and rolling scars. Less effective for ice pick.
Sessions: 3–4, spaced 4–6 weeks apart.
Results: Meaningful improvement (30–60% reduction in scar appearance in studies). Rolling scars respond most dramatically.
Cost: $800–$2,000 per session; $2,400–$8,000 for a full course.
Standard microneedling (Collagen PIN, SkinPen) is effective for mild-moderate atrophic scarring, particularly rolling scars. Less powerful than RF microneedling, but also less expensive and has shorter downtime.
Best for: Shallow rolling scars; skin texture generally.
Cost: $200–$700 per session; 3–6 sessions typically.
Ablative (CO2, Erbium): The most powerful option for atrophic scars. Ablative lasers vaporize the outer skin layers, forcing complete resurfacing. CO2 laser can achieve dramatic improvement in a single session.
Fractional non-ablative (Fraxel 1550/1927, MOXI): Treats columns of skin while leaving surrounding tissue intact — less downtime than ablative, requires more sessions.
Subcision is a minor surgical technique where a needle is inserted under a rolling scar and moved laterally to cut the fibrous bands tethering the scar to deeper tissue. It addresses the structural cause of rolling scars — the tethering — rather than trying to resurface from above.
Best for: Rolling scars specifically. Often combined with RF microneedling or filler for enhanced results.
Sessions: 1–3, spaced 4–6 weeks apart.
Cost: $300–$800 per session.
Note: Not all providers offer subcision. It requires hands-on skill and is often performed by dermatologists or experienced NPs/PAs rather than basic estheticians.
TCA Cross involves applying high-concentration trichloroacetic acid (80–100% TCA) precisely to the base of individual ice pick scars using a toothpick-sized applicator. The controlled destruction triggers repair that fills in the scar from the bottom up.
Best for: Ice pick scars — this is one of the only treatments specifically effective for them.
Sessions: 1–4, spaced 4–6 weeks apart. Multiple treatments needed as ice picks fill progressively.
Cost: $150–$500 per session (often priced per number of scars treated).
Hyaluronic acid filler (Juvederm, Restylane) or biostimulators (Sculptra, Radiesse) can be injected directly into deep rolling or boxcar scars to lift the depression.
Limitation: Filler is not permanent — HA fillers last 6–18 months. This is a maintenance approach, not a structural correction.
Best for: Patients who want immediate improvement while collagen-induction treatments take effect (combined approach).
Cost: Varies by filler type; often $400–$800 for a small volume targeted at scars.
| Treatment | Mechanism | Best for |
|---|---|---|
| Corticosteroid injections | Reduce inflammation, flatten scar tissue | Hypertrophic scars, small keloids |
| 5-FU injections | Anti-proliferative; reduces excessive collagen | Keloids |
| Pulsed dye laser (PDL) | Targets vascularity in scar tissue | Red/inflamed raised scars |
| Silicone sheeting | Hydration and pressure | Prevention and mild flattening |
| Surgical excision + radiation | Physical removal + prevention of recurrence | Large keloids (high recurrence risk without radiation) |
Keloids are the hardest type of acne scar to treat and have significant recurrence rates after removal.
PIH responds to:
PIH is NOT treated with subcision, filler, or ablative lasers — those are for structural scars.
A realistic plan for moderate atrophic scarring:
Most patients with moderate acne scarring need 6–12 months of treatment to achieve their best result. Expect visible improvement in 3–4 months; full results at 6–9 months.
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