Pimple scars show up in several distinct forms, from small deep pits to broad wavy dents to firm raised bumps. What yours look like depends on how much collagen your skin lost or overproduced during the healing process after inflamed breakouts. Most acne scars fall into one of five recognizable patterns, and many people have a mix of more than one type on the same area of skin.
Why Pimples Leave Scars
Scarring happens when a pimple triggers enough inflammation to damage the deeper layer of skin called the dermis. During that inflammatory process, collagen fibers get destroyed. If your body replaces too little collagen, you’re left with a depression or pit. If it overcompensates and produces too much collagen, you get a raised scar instead. Surface-level pimples that heal quickly rarely scar. The ones that do are typically deeper, more inflamed breakouts: cysts, nodules, and pustules that linger for days or weeks.
Indented Scars: Icepick, Boxcar, and Rolling
The most common acne scars are depressions in the skin where collagen was lost. Dermatologists group them into three types based on their shape, width, and depth. Recognizing which type you have matters because each responds differently to treatment.
Icepick Scars
These are the narrowest and often the deepest. Icepick scars are less than 2 mm across, V-shaped, and look like someone poked the skin with a sharp instrument. They’re wider at the surface and taper to a narrow point deeper in the skin. On close inspection, they resemble large, deep pores. They’re most common on the cheeks and tend to cast small shadows that make them more noticeable in side lighting.
Boxcar Scars
Boxcar scars are round or oval depressions, typically 1.5 to 4 mm in diameter, with sharp vertical edges. Think of a small punched-out hole with a flat bottom, like a miniature crater with defined walls. Unlike icepick scars, they don’t taper to a point at the base. They come in shallow versions (roughly 0.1 to 0.5 mm deep) and deeper versions (beyond 0.5 mm). Shallow boxcar scars can be hard to distinguish from normal skin texture unless you look closely. Deeper ones are obvious even at arm’s length and often appear on the temples and cheeks.
Rolling Scars
Rolling scars are the widest of the three, usually more than 4 mm across, with gently sloping edges rather than sharp walls. They create a wave-like, undulating texture across the skin. The effect is subtle when you look straight on but becomes more visible in angled light, where the surface looks uneven or rippled. Rolling scars are shallower than the other types and tend to blend together, making the skin look generally textured rather than marked by individual spots.
Raised Scars: Hypertrophic and Keloid
Some pimple scars do the opposite of sinking in. When your body deposits too much collagen during healing, the result is a firm, raised area of tissue. These are less common on the face and more typical on the chest, back, shoulders, upper arms, and jawline.
Hypertrophic scars are thick, raised bumps that stay within the boundaries of the original breakout. They feel hard or rubbery to the touch and range in color from pink to red to purple, gradually fading closer to your natural skin tone over months or years. They’re often slightly shiny compared to surrounding skin.
Keloid scars look similar at first but behave differently. They grow beyond the edges of the original pimple, sometimes significantly, and can continue expanding over time. Keloids tend to be red to purple, with a smooth, rounded surface. They contain more blood vessels and disorganized collagen, which gives them their firm, sometimes itchy texture. People with darker skin tones are more prone to keloid formation.
Color Changes That Mimic Scars
Not every mark left behind by a pimple is a true scar. Flat discolored spots are extremely common after breakouts and are often mistaken for permanent scarring. These come in two forms.
Post-inflammatory hyperpigmentation appears as flat brown, dark brown, or black patches where a pimple healed. It’s caused by excess melanin production during the healing process and is especially visible on medium to dark skin tones. These marks have no texture change, meaning the skin surface is smooth when you run your finger over it. They can persist for months but do gradually fade on their own.
Post-inflammatory erythema shows up as flat pink, red, or purple marks, most visible on lighter skin tones. These are caused by dilated or damaged blood vessels near the skin’s surface. Like hyperpigmentation, these marks are flat to the touch and typically resolve over time, though they can take six months to a year or longer.
The key distinction: if the mark is only a color change with no dent or raised area, it’s not a scar. It’s a temporary pigment or vascular response that will fade, even without treatment.
How Skin Tone Affects Appearance
The same type of scar can look quite different depending on your skin tone. On lighter skin, indented scars often appear pink or slightly red and are most visible through shadows and texture. On darker skin, the scar itself may be the same shape, but it’s frequently surrounded by or filled with post-inflammatory hyperpigmentation, making it appear darker than surrounding skin. This combination of texture change plus color change can make scars on darker skin look more prominent, even when the actual depth of the scar is the same.
Darker skin tones are also more prone to keloid scarring and to longer-lasting pigment changes, which means a single pimple can leave both a textural scar and a dark mark that each take different amounts of time to improve.
How Pimple Scars Change With Age
Acne scars don’t stay static. Most people notice their scars becoming more visible in their late 30s to early 40s. The reason is structural: as you age, you lose fat and collagen beneath the skin, which means less support for the scarred surface layer. Think of it like a mattress slowly losing its padding. As the cushion underneath compresses, the surface shows every imperfection more clearly. Wrinkles, skin laxity, and volume loss compound the appearance of existing scars, making shallow rolling scars that were barely visible at 25 look noticeably wavy at 40.
Sun damage accelerates this process. UV exposure breaks down collagen faster and can darken hyperpigmented marks, making both the texture and color components of old acne scars more pronounced over time.
Telling Scars Apart From Active Breakouts
A common source of confusion is distinguishing a forming scar from a healing pimple. Active pimples are inflamed, often tender, and may still have fluid or pus beneath the surface. A scar is what remains after the inflammation has fully resolved. If you press on the area and it still hurts, or if there’s any swelling, the pimple hasn’t finished healing yet. Scars are painless, stable in size, and don’t change day to day. Most acne scars reach their final appearance about three to six months after the breakout clears, though color changes can continue to evolve for up to a year.