Which acne scar is it. Icepick, rolling, boxcar and hypertrophic, told apart.

What are the main types of acne scars?

Most acne scarring falls into one of four patterns, and the majority of people who've had inflammatory acne, cysts, or nodules end up with some combination of them rather than just one. Three of the four are known as atrophic scars, meaning the skin sits lower than it should because tissue was lost during healing. The fourth, hypertrophic scarring, is the opposite: extra tissue rather than too little.

Icepick scars

Picture a narrow puncture mark, like something made with a needle or a small awl, going straight down into the skin. That's the shape an icepick scar makes in cross-section: narrow at the surface, often less than 2mm wide, and tracking deep. On the face they tend to cluster on the cheeks and nose, and they're usually the legacy of deep, angry cystic or nodular breakouts rather than surface-level pimples.

In raking light, icepick scars read as small, defined dark points, almost like enlarged pores that don't quite behave like pores. Because the channel runs so deep relative to how narrow it is, this is the pattern people most often describe as "small but stubborn", visible from close up and hard to shift with anything surface-level.

Of the three atrophic types, icepick scars are the most common, making up the majority of atrophic acne scarring in most people who have it.

Rolling scars

Rolling scars are broad, shallow, and undulating, more a rolling landscape than a hole. They're caused by something different to the other two types: fibrous bands forming underneath the skin during healing, tethering the surface down to the tissue beneath it like a drawstring pulled too tight in places. The skin itself isn't necessarily damaged in texture, it's being pulled from underneath.

This is why rolling scars are often the pattern people say they can "see but not point to". Under flat light the skin can look deceptively smooth. Tilt the light, or stretch the skin gently with two fingers, and the rolling, wave-like shadow appears, and often flattens out when the skin is stretched taut. That flattening response is actually a useful clue: it points to tethering as the mechanism, which matters for how it's eventually addressed.

Boxcar scars

Boxcar scars have sharply defined, vertical edges and a flatter base, closer to a shallow crater with straight walls than a smooth dip. The comparison people reach for most often is chickenpox scarring, and it's a fair one: round to oval, distinct borders, no gradual slope at the edges the way rolling scars have. They tend to appear on the cheeks and temples and can be shallow or comparatively deeper depending on how much tissue was lost.

In side light, boxcar scars throw a harder-edged shadow than rolling scars because of that defined wall. If a mark looks like it has a "rim" around it rather than fading gradually into surrounding skin, that's the boxcar pattern.

Hypertrophic scars

Hypertrophic scars are the outlier of the group because they're raised, not indented, sitting proud of the surrounding skin. The distinguishing feature is that a hypertrophic scar stays within the boundary of the original blemish. It doesn't spread outward over time, and it can settle and soften somewhat as it matures, though it doesn't usually disappear on its own. These are less common as an acne outcome on the face and appear more often on the jawline, chest, back, or shoulders, areas where the skin sits under more tension.

At a glance

Is a raised scar always hypertrophic?

Not necessarily, and this is worth naming clearly rather than glossing over. There's a related but distinct category called keloid scarring, which is also raised, but unlike hypertrophic scarring, it grows beyond the edges of the original mark and keeps extending into surrounding skin over time. Keloid scarring is more common in people with darker skin tones and has a genetic component, and it behaves differently enough from hypertrophic scarring that it needs a different kind of management, one that sits with a doctor rather than a laser clinic.

We name it here for one reason: so you can tell the two apart, not so we can offer to treat it. A scar that is clearly staying within its original margin is a different conversation to one that keeps spreading past it. If yours is the second kind, that's a doctor conversation first. Pink's role picks up with the atrophic and hypertrophic scarring that laser-based resurfacing is genuinely suited to, and we'd rather tell you that plainly than blur the line.

How common is each type of acne scar?

Atrophic scarring, the icepick, rolling and boxcar group together, accounts for the large majority of acne scarring overall. Within that group, icepick scars tend to be the most frequently seen pattern, with boxcar scars the next most common and rolling scars also well represented. Hypertrophic scarring is comparatively uncommon as a facial outcome of acne, though it does turn up more on the body.

In practice, almost nobody has just one type. A face that's had a run of deep cystic breakouts across the cheeks, temples and jaw over a few years will usually show a mix: some icepick marks near the nose, a run of boxcar scarring across one cheek, and rolling texture where the skin has been tethered more broadly. That mixed presentation is normal, not a sign that anything went unusually wrong.

How do I tell my scar types apart at home?

Raking light is the simplest tool you already have. Stand near a window or lamp and turn your face so the light hits your skin from the side rather than straight on. Shadows will fall into the depressions and along the raised edges, showing shape that a bathroom mirror under overhead light usually flattens out.

A few things to look for once the light is doing its job:

• Narrow, deep points that look almost like enlarged pores in a straight line down. That's more likely icepick.
• Broad, soft undulation, especially if it softens or flattens when you gently stretch the skin. That's the rolling pattern, and the tethering behind it.
• Defined, sharp-edged craters with a flatter floor and a visible rim. That's boxcar.
• Raised tissue that stays inside the original mark's footprint, sometimes slightly pink or firm to the touch. That's hypertrophic, assuming it isn't extending outward, which would point toward keloid instead.

This kind of home check is a genuinely useful starting point, and it's also where its usefulness ends. Most people have overlapping types, the depth of a scar matters as much as its shape, and an accurate read benefits from a trained eye under proper lighting rather than a phone camera at 11pm. Consider what you find here a way to arrive at a consultation with a clearer sense of what you're looking at, not a final answer.

What's the difference between a scar and a mark that isn't a scar?

This is one of the most common points of confusion, and it matters enough to walk through properly, because getting it wrong changes how worried you should be, not just what treatment makes sense.

A true scar, whether icepick, rolling, boxcar or hypertrophic, involves an actual change in the structure of your skin: either tissue was lost (atrophic) or extra tissue was laid down (hypertrophic). That structural change doesn't reverse on its own or fade with time, regardless of your skin tone. It stays as it is unless something is done to physically resurface, release or remodel it.

A flat brown or tan mark left behind after a pimple heals is a completely different thing. That's called post-inflammatory hyperpigmentation, and it isn't a scar at all: there's no change in texture or depth, just a temporary shift in pigment where inflammation has switched melanin production into overdrive for a while. It's very common, and unlike true scarring, it typically fades on its own over roughly six to eighteen months, faster with good sun protection. Pink's Face & Body Skin Lightening & Brightening programme is the place to start if that's your main concern. This distinction shows up more often, and matters more, for people with darker skin tones, where post-inflammatory hyperpigmentation is common and easily mistaken for scarring that will never change. If your skin runs deeper on the Fitzpatrick scale and true scarring is also part of the picture, we go into what that means for treatment choices in our guide to acne scar treatment for darker skin.

There's a third pattern worth naming so you're not left guessing if it doesn't fit either description above: a flat red or pink mark, rather than brown, is usually a vascular mark rather than a pigment one, and it isn't part of this article's scope or Pink's toolkit. If that's what you're looking at, Pink's guide to the red marks acne leaves behind covers it properly.

If what you're seeing has genuine depth, a rolled or pitted texture you can feel as much as see, or a raised area that doesn't fade with time, that's the true scarring this article is about. If it's a flat colour change with no textural difference, it very likely isn't a scar in the structural sense at all, brown or red.

Why does it matter which type I have?

Because the type you have determines what actually helps. A narrow, deep icepick scar and a broad, shallow rolling scar are different problems in the skin, formed by different mechanisms, and treating them as though they're the same thing is the most common reason people feel let down by scar treatment. Depth, shape and the tissue mechanism behind each type all shape what a sensible plan looks like, which is why an accurate read of your specific pattern comes before any conversation about a plan, not after it.

At Pink, that assessment draws on tools suited to different depths and structures, TCA CROSS for the narrow, deep channels that surface treatments can't reach, Q-Switched Fractional Nd:YAG and Er:YAG fractional resurfacing for broader textural remodelling, FRAC3 and Photoacoustic Toning where appropriate, and PinkRX peels supporting the skin between sessions. Which combination makes sense for your skin is a consultation conversation, not something this article can responsibly answer in the abstract. You can see how Pink approaches scar revision more fully on the Acne Scar Revision page.

Frequently Asked Questions

What's the most common type of acne scar?

Icepick scars are typically the most frequently seen pattern among atrophic acne scars, followed by boxcar scars, with rolling scars also common. Most people who have noticeable scarring have a mix of types rather than a single pattern.

Can rolling, boxcar and icepick scars appear together?

Yes, and this is the norm rather than the exception. Prolonged or repeated inflammatory acne, especially cystic or nodular breakouts, tends to produce a mixed presentation across an affected area rather than one uniform scar type.

Is a hypertrophic scar the same as a keloid scar?

No. Both are raised, but a hypertrophic scar stays within the boundary of the original blemish and can soften over time, while a keloid scar grows beyond that boundary and keeps extending into surrounding skin. Keloid scarring is more common in darker skin tones and is managed medically rather than with laser-based resurfacing.

How do I know if my mark is a scar or just hyperpigmentation?

A true scar involves a genuine change in skin texture or depth, either a depression or raised tissue, and it doesn't fade on its own. Post-inflammatory hyperpigmentation is a flat brown or tan mark with no textural change, and it typically fades over roughly six to eighteen months. This distinction is especially relevant for darker skin tones, where hyperpigmentation is common and easy to mistake for lasting scarring.

Can I diagnose my own scar type accurately at home?

Raking or side light can give you a genuinely useful first read, especially for telling narrow icepick marks apart from broader rolling or boxcar patterns. Most people have overlapping scar types and varying depths within the same area, though, so a proper assessment at consultation gives a far more reliable picture than a mirror check alone.

Book Your Free Consultation

The clearest way to know exactly which scar types you're dealing with, and what a sensible plan looks like for your skin, is a proper look in person. It's easy, no-obligation, and the honest next step after reading this far.

Book your free consultation, or read more about how Pink approaches scar revision on the Acne Scar Revision page.