In short. Acne scars are not one condition but several recognisable shapes: rolling, boxcar, ice-pick and raised scars. The shape matters more than the name, because it decides which treatment can reach the problem: a tethered depression needs release, a flat-floored boxcar responds to resurfacing, and a narrow deep tract needs focal work. Most faces carry a mixture.
Key points
- Rolling scars are shallow and wave-like, held down by fibrous bands, so surface resurfacing alone often disappoints.
- Boxcar scars have a defined edge and a flat floor, and usually respond to remodelling over several sessions.
- Ice-pick scars are narrow and deep; surface treatment barely reaches the bottom, so improvement is modest.
- Hypertrophic scars stay within the original lesion; keloids extend beyond it and can keep growing.
- Raised and depressed scars are different diagnoses, managed on different plans.
What are the main shapes of acne scar?
An assessment sorts scars by shape, depth and what holds them down, because those three features decide which treatment can reach the problem. The recognisable depressed shapes are rolling, boxcar and ice-pick; raised scars behave quite differently and are not a variant of the same thing. You do not need to diagnose yourself, but a plan that does not distinguish a tethered scar from a surface scar, or a raised scar from a depressed one, was not built from an examination.
| Shape | What it looks like | What holds it | What reaches it |
|---|---|---|---|
| Rolling | Shallow, wave-like unevenness that changes with the light | Fibrous bands tethering the skin to deeper tissue | Release of the bands, then surface treatment |
| Boxcar | Defined edge and flat floor, like a small rectangular dip; wider than ice-pick | A sharply edged depression rather than a narrow tract | Remodelling, particularly fractional resurfacing and microneedling, over several sessions |
| Ice-pick | Narrow and deep, sometimes extending to deeper layers | A narrow, deep tract | Focal techniques; surface treatment barely reaches the bottom |
| Hypertrophic | Raised, staying within the boundary of the original lesion | Extra fibrous tissue within that boundary | Injections, pressure, silicone, sometimes surgical revision |
| Keloid | Raised and extending beyond the original spot; can keep growing | Extra fibrous tissue beyond the original boundary | Injections, pressure, silicone, sometimes surgical revision |
Why do rolling scars need release rather than resurfacing?
Rolling scars are shallow and wave-like, giving the skin a gentle unevenness that changes with the light. They are usually held down by fibrous bands tethering the skin to deeper tissue, which is why resurfacing the surface alone often disappoints. Releasing the bands, and then treating the surface, addresses both halves of the problem.
What makes boxcar scars respond to remodelling?
Boxcar scars have a defined edge and a flat floor, like a small rectangular dip. They are wider than ice-pick scars and usually respond reasonably to treatments that remodel the skin, particularly fractional resurfacing and microneedling, often over several sessions.
Ice-pick scars: narrow, deep and stubborn
Ice-pick scars are narrow and deep, sometimes extending down to the deeper layers. They are the most stubborn. A treatment that works on the surface barely reaches the bottom of a narrow, deep tract, which is why they are often addressed with focal techniques, and why improvement here is usually modest rather than dramatic.
Why is a raised scar a different diagnosis?
Some acne, particularly on the jawline, chest and back, heals with a raised scar rather than a dent. Hypertrophic scars stay within the boundary of the original lesion; keloids extend beyond it and can keep growing. Both are a different diagnosis from depressed scarring, and both are treated with injections, pressure, silicone and sometimes surgical revision rather than resurfacing.
What does a mixed face mean for the plan?
Most faces have several shapes at once, in different areas, which is why the plan is usually a combination and usually sequenced over months. The honest description of the result is that the skin becomes smoother and less marked, not that it returns to what it was before the acne started. A tethered scar and a surface scar need different things, and one plan built for a single shape will miss the rest.
When should a dermatologist see the scar?
- A scar keeps growing beyond the original spot, or is painful or itchy.
- A scar bleeds, ulcerates or changes shape.
- Scarring appeared suddenly without significant acne, or after starting a new medicine.
Sources
- American Academy of Dermatology — acne scars: types and treatment
- British Association of Dermatologists — patient information on acne scarring
- NICE Clinical Knowledge Summaries — acne vulgaris
Internal links
Frequently asked questions
Which type of acne scar is easiest to improve?
Shallow rolling scarring and boxcar scarring generally respond best, because the problem is close enough to the surface for remodelling treatments to reach it. Narrow deep ice-pick scars are the most stubborn, since a surface treatment barely reaches the bottom of a deep tract.
Can one treatment fix several scar types at once?
Rarely. Most faces carry several shapes in different areas, and a plan usually combines a releasing step for tethered scars, a surface step for shallow texture and sometimes a filling step for lost volume. That is why scar treatment is sequenced over months rather than done in one session.
Is a raised scar the same as a depressed scar?
No, and they are treated on completely different plans. A raised scar is extra fibrous tissue, sometimes extending beyond the original spot, and is managed with injections, pressure, silicone or surgical revision. A depressed scar is missing tissue, and is managed by releasing, resurfacing or refilling.
Risks & Limitations
- Scarring is improved, not erased. No treatment restores skin that fibrous tissue has replaced.
- Results take months and several sessions, judged over 6–12 months against standardised photographs.
- Resurfacing carries real downtime and a pigment-change risk that is higher in darker skin tones.
- Treating the surface while acne is still active allows new inflammation to create new scars.
- Unregulated lightening creams can thin the skin and leave pigmentation that is harder to treat.
When to Seek Care
- Acne that is still active and producing new deep, tender lesions — medical control comes first.
- A scar that is raised, firm, painful or still growing after the acne has settled.
- A scar that bleeds, ulcerates or changes shape.
- Skin that is thinning, streaking or breaking out after a lightening cream.
- Scarring with fever, joint pain or weight change, which may point to a systemic cause.
References & Further Reading
- American Academy of Dermatology (AAD) — patient guidance on this condition
- International League of Dermatological Societies (ILDS) — global standards of care
- National Institute for Health and Care Excellence (NICE, UK) — relevant guidance
- Cochrane Library — systematic reviews on the treatments discussed here
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.