How Should Different Types Of Acne Scars (Ice-Pick, Rolling, And Boxcar) Be Categorized And Pre-Treated Prior To Laser Resurfacing? Match Scar Morphology To The Right Pre-Treatment

Acne scars should be categorized by their shape, width, depth, and underlying tissue attachment before laser resurfacing. Ice-pick scars are narrow and deep, so they usually require punch excision first; rolling scars are tethered by fibrous bands and are typically pre-treated with subcision; and boxcar scars may be treated directly with laser when shallow, while deeper lesions often require punch elevation. This anatomical matching prevents the laser from being used where it cannot adequately reach or correct the structural defect.

Laser resurfacing is most effective for superficial textural irregularities, not every type of acne scar. Deep or tethered scars generally need a targeted structural procedure first, followed by resurfacing to refine the remaining surface irregularity.

Why Scar Classification Matters

Scar depth determines treatment suitability

Fractional CO2 and Er:YAG resurfacing create controlled thermal or ablative treatment zones that stimulate re-epithelialization and dermal collagen remodeling. Their effectiveness is limited when a scar extends substantially deeper than the planned treatment depth.

A laser can smooth the surface of a depression, but it cannot reliably remove a narrow deep tract or release a fibrous band pulling the skin downward.

Scar structure matters as much as appearance

Two scars may both appear as depressions but require different procedures. A narrow vertical defect, a broad tethered depression, and a sharply edged crater represent different anatomical problems.

For that reason, treatment planning should assess the scar under appropriate lighting and with examination of its depth, edges, mobility, and response to stretching.

How to Categorize Each Scar Type

Ice-pick scars: narrow and deep

Ice-pick scars are small, narrow, funnel- or V-shaped depressions with pinpoint openings. Their tracts commonly extend into the deeper dermis or sometimes toward the subcutaneous tissue.

Because the defect is deep relative to its surface diameter, conventional laser resurfacing may treat the surrounding skin without reaching the full base of the scar.

Rolling scars: broad and tethered

Rolling scars are wide, shallow depressions with gently sloping edges that create an undulating or “hills and valleys” appearance. Their defining feature is often not simply volume loss but fibrous tethering at the dermal-subcutaneous junction.

These scars may become less visible when the skin is stretched, which supports the presence of underlying tethering rather than a fixed, sharply walled defect.

Boxcar scars: sharply edged depressions

Boxcar scars are round, oval, or rectangular depressions with clearly demarcated vertical or near-vertical walls. They may be shallow or deep, so the category alone does not determine whether pre-treatment is necessary.

Shallow-to-moderate boxcar scars often fall within the effective treatment range of fractional laser resurfacing. Deep boxcar scars extend farther into the dermis and may need elevation before laser refinement.

Appropriate Pre-Treatment Before Resurfacing

Ice-pick scars: punch excision

Deep ice-pick scars are generally pre-treated with punch excision. A round punch instrument removes the narrow scar tract, after which the site may be closed primarily or managed with a small graft or other clinician-selected repair.

The procedure should be allowed to heal before broader resurfacing. Laser treatment can then improve the surrounding texture and the residual transition between the treated scar site and adjacent skin.

Rolling scars: subcision

Rolling scars are usually pre-treated with subcision, which releases the fibrous bands tethering the depressed skin to deeper tissue. Once the depression is mechanically released, the elevated skin can remodel more effectively.

Laser resurfacing may follow subcision to address residual surface irregularity and stimulate collagen remodeling. In cases with substantial volume loss, a clinician may also consider tissue augmentation as part of a combination plan.

Deep boxcar scars: punch elevation

Deep boxcar scars may benefit from punch elevation. This technique raises the depressed scar floor while preserving the surrounding tissue, addressing the depth before laser resurfacing smooths the edges and surface.

The choice between direct resurfacing and elevation depends on the scar’s depth, wall definition, and response to examination. Deep lesions should not be assumed to respond like shallow boxcar scars.

Shallow boxcar scars: direct laser treatment

Mild-to-moderate, relatively shallow boxcar scars can often be treated directly with fractional CO2 or Er:YAG resurfacing. Similar superficial varicella-type scars may also be suitable for direct resurfacing.

The laser’s role is to blend sharp transitions, remodel superficial dermal irregularities, and stimulate new collagen. It is not intended to replace excision or elevation when the defect is structurally deep.

Sequencing Laser Resurfacing

Treat the structural defect first

The sequence should generally follow the anatomy: release tethering, excise narrow deep tracts, or elevate deep depressions before performing broad resurfacing.

This allows the laser to focus on surface blending and dermal remodeling rather than attempting to correct a defect it cannot adequately reach.

Allow adequate healing

Punch procedures and subcision create their own healing requirements. Resurfacing should be scheduled only after the pre-treated areas have sufficiently healed and the treating clinician has assessed the tissue.

The appropriate interval depends on the procedure, wound healing, skin type, treatment intensity, and presence of complications. It should be determined clinically rather than by a fixed universal timeline.

Use a combination approach for mixed scars

Most patients have more than one scar subtype. A single treatment setting is therefore unlikely to be optimal for a face containing deep ice-pick, tethered rolling, and shallow boxcar scars.

A tailored plan may combine punch procedures for selected deep scars, subcision for tethering, and fractional laser resurfacing for the broader textural component.

Understanding the Trade-offs

Laser alone is less effective for deep ice-pick scars

Deep ice-pick scars often penetrate beyond the useful reach of standard resurfacing treatments. Increasing laser intensity to compensate may increase thermal injury and recovery burden without reliably correcting the narrow deep defect.

Targeted treatment is usually more rational than escalating resurfacing indiscriminately.

Subcision does not fully resurface the skin

Subcision addresses the bands beneath rolling scars, but it does not necessarily eliminate surface irregularity or sharply defined scar edges. Residual texture may still require fractional laser resurfacing or another clinician-selected treatment.

Subcision also carries procedure-specific risks, including bruising and swelling, which should be discussed during consent.

Punch procedures create healing sites

Punch excision and punch elevation can correct selected deep scars but introduce small surgical wounds and the possibility of visible marks, contour changes, or pigmentary alteration. Patient selection and precise technique are important.

These procedures should be performed by an appropriately qualified clinician familiar with acne-scar surgery and laser-based resurfacing.

Results are usually partial and staged

Atrophic scars involve permanent loss or remodeling of dermal support. Treatment can produce meaningful smoothing, but complete removal is not a realistic expectation.

Multiple sessions or staged procedures may be needed, particularly when scar types and depths vary across the treatment area.

Active acne should be controlled first

New inflammatory lesions can create additional scars and complicate procedural healing. Acne control, skin-barrier assessment, medication review, and evaluation for infection or abnormal scarring should be part of treatment planning before resurfacing.

Laser parameters and procedure choice also require attention to skin phototype and the risk of post-inflammatory hyperpigmentation.

Making the Right Choice for Your Goal

The practical decision is to match the pre-treatment to the scar’s structural problem.

If your primary focus is deep ice-pick scars: Use punch excision or another clinician-selected focal treatment before laser resurfacing, because laser alone may not reach the full depth.
If your primary focus is rolling scars: Address the underlying fibrous tethering with subcision before using resurfacing to refine the remaining texture.
If your primary focus is deep boxcar scars: Consider punch elevation before resurfacing to restore the depressed scar floor.
If your primary focus is shallow boxcar scars: Direct fractional CO2 or Er:YAG resurfacing may be appropriate without focal surgical pre-treatment.
If your primary focus is mixed acne scarring: Combine procedures according to each scar’s morphology rather than applying one laser protocol uniformly.

Accurate scar classification turns laser resurfacing from a generic procedure into a targeted, staged treatment plan.

Summary Table:

Scar Type	Characteristics	Pre-Treatment	Laser Resurfacing Role
Ice-pick	Narrow, deep, V-shaped	Punch excision	Smooth surrounding texture
Rolling	Broad, shallow, tethered	Subcision	Refine surface irregularity
Boxcar (shallow)	Sharply edged, shallow	None	Direct resurfacing
Boxcar (deep)	Sharply edged, deep	Punch elevation	Smooth edges and surface

Seeking advanced laser systems and comprehensive aesthetic solutions for your clinic or premium salon? BELIS offers professional-grade medical aesthetic equipment, including diode/Alexandrite lasers, fractional CO2, Er:YAG, and more, to elevate your acne scar treatments. With our complete product portfolio and expert support, you can deliver tailored, high-quality care that meets your patients' needs. Partner with BELIS for reliable technology and superior results. Contact us today to learn more about our innovative solutions!