Rolling vs Boxcar Acne Scars

Rolling and boxcar scars are two common types of depressed acne scars. Although both can make the skin appear uneven, they have different shapes and underlying structures.

Identifying the scar type is important because rolling scars and boxcar scars often require different procedures. Many patients have a combination of scar types, so treatment may involve more than one method.

What Are Rolling Acne Scars?

Rolling scars are broad, shallow depressions with smooth, sloping edges. They can give the skin a wavy or uneven appearance, especially under side lighting.

These scars often develop when fibrous bands beneath the skin pull the surface downward.

Common features include:

• Wide, shallow depressions
• Soft or sloping edges
• A wave-like skin texture
• Scars that may improve when the skin is stretched
• Attachment to deeper tissue

Because the main problem may be beneath the skin, surface treatment alone may not provide enough improvement.

What Are Boxcar Acne Scars?

Boxcar scars are round or oval depressions with more clearly defined edges.

They may be shallow or deep and often resemble small indentations or craters. Unlike rolling scars, boxcar scars usually have sharper borders.

Common features include:

• Round or oval depressions
• Clearly defined edges
• Flat or uneven scar bases
• Shallow or deep indentations
• Scars that remain visible when the skin is stretched

Shallow boxcar scars may respond well to resurfacing procedures, while deeper scars may require more targeted treatment.

How Are They Different?

The main differences are their shape and how they attach to the underlying tissue.

Rolling scars generally have:

• Smooth, sloping edges
• A wider and shallower appearance
• Fibrous attachments beneath the skin
• A wave-like texture

Boxcar scars generally have:

• Sharper, more defined edges
• A round or oval shape
• Variable depth
• A more crater-like appearance

A dermatologist may examine the scars under different lighting and gently stretch the skin to evaluate their depth and attachment.

Treatment for Rolling Scars

Subcision is commonly considered for rolling scars that are attached to deeper tissue.

During subcision, a needle or cannula is moved beneath the scar to release the fibrous bands pulling the skin downward. Temporary bruising, swelling, and tenderness may occur.

Rolling-scar treatment may also include:

• Microneedling
• Radiofrequency microneedling
• Fractional laser treatment
• Injectable fillers
• Collagen-stimulating procedures
• Combination treatment

Subcision may be combined with resurfacing or injectable treatment when both deep attachment and surface texture need improvement. Scar treatment is generally most effective when matched to the individual scar type.

Treatment for Boxcar Scars

Treatment depends largely on whether the scars are shallow or deep.

Possible options include:

• Fractional laser resurfacing
• Microneedling
• Radiofrequency microneedling
• Chemical reconstruction techniques
• Punch elevation
• Punch excision
• Injectable fillers for selected scars

Shallow boxcar scars may respond to procedures that stimulate collagen and resurface a wider area. Deep scars with clearly defined edges may require targeted procedures rather than surface treatment alone.

Why Combination Treatment Is Common

Many patients have rolling, boxcar, and ice pick scars at the same time.

One procedure may improve overall texture but provide limited change in deep or attached scars. A personalized combination may therefore include:

• Subcision for attached rolling scars
• Laser or microneedling for general texture
• Targeted chemical treatment for selected narrow scars
• Punch treatment for deep boxcar scars
• Fillers for selected depressions
• Treatment for redness or pigmentation

Treatment is usually performed gradually to allow the skin to heal and to evaluate how each scar responds. Reviews of acne-scar management emphasize matching and combining procedures according to scar type rather than using one treatment for every scar.

Control Active Acne First

Active breakouts should generally be controlled before beginning intensive scar treatment.

Continuing acne may create new scars while existing scars are being treated. A consultation may review:

• Current acne activity
• Scar types and depth
• Skin tone and sensitivity
• Previous treatment reactions
• History of pigmentation
• Current medications
• Treatment goals

Acne management can help reduce the formation of additional scars and support more consistent results.

Considerations for Different Skin Tones

Patients with darker or pigment-sensitive skin may have a higher risk of post-inflammatory pigmentation after aggressive treatment.

The dermatologist may adjust:

• Laser type and energy
• Microneedling depth
• Number of treatment passes
• Session intervals
• Pretreatment skincare
• Aftercare products

Conservative settings, daily sunscreen, and sufficient healing time can help reduce unnecessary inflammation.

Downtime and Treatment Expectations

Temporary reactions depend on the procedure and treatment intensity.

Possible downtime may include:

• Redness
• Swelling
• Bruising
• Dryness or flaking
• Small crusts
• Temporary darkening
• Increased sensitivity

Acne scars rarely disappear completely, but they may become smoother and less noticeable with appropriate treatment. Several sessions are often necessary, and improvement usually develops gradually as collagen remodeling continues.

Questions to Ask During Consultation

Before treatment, consider asking:

• Do I have rolling scars, boxcar scars, or both?
• Are any scars attached to deeper tissue?
• Which scars may benefit from subcision?
• Do I need laser, microneedling, or targeted treatment?
• Will combination treatment be necessary?
• How many sessions may be required?
• What downtime should I expect?
• What is my risk of pigmentation?
• When will improvement become visible?

Match the Treatment to the Scar Type

Rolling scars commonly require treatment of the fibrous attachments beneath the skin, while boxcar scars may require resurfacing or targeted treatment based on their depth.

Accurate scar classification, control of active acne, personalized procedure selection, and proper aftercare are more important than choosing one popular treatment for every scar.