Skin Care Education

Acne Scars

The lasting marks and textural changes that remain on the skin after acne has healed. Different types form through different mechanisms and respond differently to treatment.

What Are Acne Scars?

Acne scars are the marks, pits, or textural changes that remain on the skin after a breakout has healed. They develop when the inflammatory process of an acne lesion damages the surrounding skin tissue, and the skin’s repair process does not fully restore the original structure.

It is worth distinguishing between true acne scars and post-inflammatory hyperpigmentation. True scars involve a physical change to the skin’s surface, such as a depression, pit, or raised area. Post-inflammatory hyperpigmentation refers to the flat dark or pink marks that tend to fade over time. Both are common consequences of acne, but they are different in nature and respond to different approaches.

Acne scarring affects people across all skin tones, though the way scars present can vary. Medium to deeper skin tones are more prone to prominent post-inflammatory pigmentation alongside or instead of textural scarring, and this can in some cases be more visually significant than the structural change itself.

Types of Acne Scars

Rolling scars: broad, shallow depressions with gently sloping edges that give the skin a wavy, undulating appearance. Generally the most responsive type to collagen-stimulating treatments.
Boxcar scars: wider depressions with sharply defined vertical walls, similar in appearance to a small crater. Common on the cheeks and temples.
Ice pick scars: narrow, deep pits extending straight down through the skin layers. The most challenging type to improve due to their depth and narrow diameter.
Hypertrophic scars: raised, thickened scar tissue that sits above the skin surface, caused by an overproduction of collagen during healing. Less common with facial acne but more prevalent in deeper skin tones.
Post-inflammatory hyperpigmentation: flat dark or pinkish-red marks left after inflammation resolves. Not a structural scar but frequently grouped with acne scarring in discussion.

Causes and Contributing Factors

Factor	Description
Inflammatory acne	Deeper, more inflamed breakouts such as nodules and cysts are far more likely to cause scarring than surface-level blackheads or whiteheads. The more severe the inflammation, the greater the risk of tissue damage and subsequent scarring.
Inflammatory acne	Manipulating spots drives bacteria deeper into the skin and creates additional trauma to the surrounding tissue, significantly increasing the likelihood and severity of scarring.
Picking and squeezing	The longer inflammatory acne is left without appropriate management, the greater the cumulative damage to the surrounding skin tissue over time.
Delayed treatment	The longer inflammatory acne is left without appropriate management, the greater the cumulative damage to the surrounding skin tissue over time.
Genetics	Some individuals are naturally more prone to scarring based on how their skin heals in response to inflammation. The tendency to form hypertrophic or keloidal scars in particular has a hereditary component.
Skin tone	Medium to deeper skin tones are more likely to develop prominent post-inflammatory pigmentation alongside or instead of textural scarring, due to higher melanin activity in response to inflammation.

Frequently Asked Questions: Acne Scars

A dark or pinkish-red flat mark left after a spot is post-inflammatory hyperpigmentation, not a structural scar. True acne scars involve a physical change to the skin’s surface such as a pit, depression, or raised area. Both are common after acne and can occur together, but they are different in nature. Post-inflammatory marks tend to fade over time, while structural scars represent a permanent change to the skin’s architecture.

Post-inflammatory hyperpigmentation can fade naturally over months to years, particularly with consistent sun protection, which prevents UV stimulation from darkening the marks further. True textural scars, such as rolling, boxcar, and ice pick scars, do not resolve on their own as they represent a permanent structural change to the skin tissue.

Ice pick scars are narrow and extend deep into the skin, making them difficult to access and remodel from the surface. Treatments that work by stimulating collagen production in the surrounding tissue are effective for broader, shallower scar types because there is more surface area to work with. Ice pick scars respond less readily to these approaches due to their narrow, deep geometry.

Yes. All skin tones can develop acne scarring, though the presentation differs. People with deeper skin tones are more prone to pronounced post-inflammatory pigmentation, which can be darker and longer-lasting than in lighter skin tones. The appropriate approach to improving acne scarring therefore needs to account for skin tone, as some methods carry different risk profiles across the spectrum.