Acne scars and hyperpigmentation are not the same thing, though they often appear together and are easy to confuse. The key difference: acne scars involve a permanent change in skin texture, while hyperpigmentation is a flat color change with no textural difference. Running your finger over the mark is one of the simplest ways to tell them apart. If you feel a dip, a bump, or rough skin, that’s a scar. If the skin is smooth but darker than the surrounding area, that’s hyperpigmentation.
What Causes Each One
Both problems start with inflamed acne, but they result from completely different processes happening inside the skin.
Acne scars form when inflammation damages the deeper layers of skin and the body’s repair job goes wrong. In 80 to 90 percent of cases, the result is a net loss of collagen, the structural protein that keeps skin smooth. That loss creates depressions or pits in the skin. Less commonly, the body overproduces collagen during healing, leaving a raised, thickened scar. Either way, the physical structure of the skin has changed. Inflammatory cells are found in about 77 percent of depressed acne scars, which helps explain why more severe, longer-lasting breakouts carry a higher risk of permanent scarring.
Hyperpigmentation, by contrast, is purely a color issue. When acne inflames the skin, the inflammatory process releases a cascade of chemical signals, including prostaglandins and reactive oxygen species, that stimulate the skin’s pigment-producing cells. Those cells respond by churning out excess melanin, the pigment that gives skin its color. The melanin gets deposited in surrounding skin cells, leaving behind a dark spot once the pimple itself is gone. The pigment cells aren’t damaged. They’re just overactive.
How They Look on Different Skin Tones
Hyperpigmentation typically shows up as brown to grey-brown flat spots on the cheeks and jawline. On darker skin tones, the marks can also appear violaceous, a deep purple-brown shade that signals lingering inflammation beneath the surface. Darker skin tones are more prone to noticeable hyperpigmentation because the pigment-producing cells are more reactive to inflammatory triggers.
There’s a third category many people don’t know about: post-inflammatory erythema, or red marks left after acne. These are more common on lighter skin tones (typically fair to medium complexions) and are caused by damaged or dilated blood vessels near the skin’s surface rather than by excess melanin. If you press a glass against the mark and the redness fades, that’s erythema, not hyperpigmentation. Both tend to resolve over time, which separates them from true scars.
The Texture Test
Dermatologists distinguish scars from pigment changes primarily by texture. A depressed scar creates a visible indentation, sometimes called an ice pick, boxcar, or rolling scar depending on its shape and depth. A raised scar feels firm and elevated above the surrounding skin. Hyperpigmentation, on the other hand, is completely flat. You can see it, but you can’t feel it.
This sounds straightforward, but in practice the two often coexist on the same face, and even trained dermatologists can disagree. One study of clinicians evaluating hyperpigmentation in acne patients found a 24 percent difference in diagnosis rates between the most and least frequent raters. The overlap was greatest when patients still had active acne. So if you’re struggling to tell what you’re dealing with, you’re not alone.
How Long Each One Lasts
This is where the distinction matters most. Hyperpigmentation fades on its own. When the excess melanin is confined to the upper layers of skin, it typically resolves within 6 to 12 months without any treatment. When melanin leaks into the deeper layers of skin, which happens with more intense inflammation, the dark spots can persist for years.
Acne scars are permanent. The collagen loss or overgrowth that created the textural change doesn’t reverse on its own. Without active treatment, a depressed or raised scar will look essentially the same years from now as it does today. This is why early, aggressive treatment of inflammatory acne is so important. Preventing the deep inflammation that destroys collagen is far easier than trying to rebuild skin texture after the fact.
Treating Hyperpigmentation
Because hyperpigmentation is a surface-level pigment issue, it responds well to topical treatments that either slow melanin production or speed up skin cell turnover. Retinoids increase the rate at which pigmented skin cells are replaced by new ones. Azelaic acid and products containing vitamin C help interrupt the melanin production pathway. Consistent sunscreen use is essential during treatment because UV exposure triggers more melanin production and can darken existing spots.
For stubborn dark spots that haven’t responded to topical care after several months, chemical peels and certain light-based treatments can accelerate fading. The goal with all of these approaches is the same: clear out the excess melanin faster than your skin would on its own.
Treating Acne Scars
Structural scars require treatments that physically remodel the skin. The most effective options work by triggering the body to produce new collagen in the scarred area. Microneedling, which creates controlled micro-injuries in the skin, has been shown to improve scar appearance and skin texture across all treated patients in clinical studies. Fractional CO2 laser treatments, which deliver heat energy to stimulate collagen-producing cells called fibroblasts, have demonstrated roughly 50 percent improvement in moderate-to-severe acne scars.
These treatments typically require multiple sessions spaced weeks apart, and full results develop over months as new collagen gradually fills in the depressed areas. Raised scars may be treated differently, sometimes with injections that soften the excess tissue. The important point is that scar treatment works on a fundamentally different level than pigment treatment. You’re rebuilding structure, not clearing color.
Preventing Both
The single most effective way to prevent both scars and hyperpigmentation is to treat acne early and reduce inflammation before it has a chance to cause lasting damage. The American Academy of Dermatology’s current guidelines strongly recommend benzoyl peroxide, topical retinoids, and, when needed, oral antibiotics as frontline treatments. For acne that is severe, causing scarring, or not responding to standard therapy, isotretinoin is strongly recommended.
Picking or squeezing pimples dramatically increases the risk of both outcomes. Squeezing drives inflammation deeper into the skin, increasing collagen damage (which leads to scars) and amplifying the inflammatory signals that trigger excess melanin (which leads to dark spots). Leaving breakouts alone or treating them with appropriate products gives your skin the best chance of healing without leaving a trace.