How to Get Rid of Acne Scars: Honest Guide

Skin Science

How to get rid of acne scars: what fades them and what does not

Most of what people call "acne scars" are actually temporary marks. Knowing which type you have changes everything about how you approach them.

Quick answer

Flat pink or brown marks left after a pimple (PIE and PIH) fade with consistent OTC actives like niacinamide, retinol, and daily SPF, typically over 8 to 24 weeks. True atrophic scars (pits) involve permanent tissue loss and require dermatological procedures. No serum fills a pit.

Habib A Muflih Founder of MAXXING
| Last Updated: June 2026 | 11 min read

For informational purposes only. Not medical advice. Consult a licensed dermatologist for diagnosis and treatment of acne scarring.

8-12 wk
Typical timeline for visible PIH improvement with niacinamide
Bissett et al. 2005
44%
Improvement in fine lines and texture with 0.1% retinol over 52 weeks
Kafi et al. 2015
15.5%
Decrease in atrophic scar counts with adapalene 0.3%/BPO 2.5% over 24 weeks
Dreno et al. 2018
96%
PIH improvement rate when hydroquinone is used with SPF vs 81% without it
Topical HQ Review, 2023
Table of contents
  1. Marks vs. true scars: the distinction that matters
  2. PIE and PIH explained
  3. OTC ingredients with real evidence
  4. Retinol for texture and tone
  5. Niacinamide for the look of marks
  6. Niacinamide product comparison
  7. Building a post-acne routine
  8. When OTC is not enough
  9. Frequently asked questions
  10. References

01Marks vs. true scars: the distinction that matters

The word "scar" covers a wide range of outcomes, and the internet treats them all as the same problem. They are not. There are two entirely different categories:

  • Post-inflammatory marks (PIE and PIH): flat discolorations on the skin surface. No structural damage. These will fade, given time and the right approach.
  • True scars: permanent changes to the skin's architecture. Atrophic scars (ice pick, rolling, boxcar) involve tissue loss in the dermis. Hypertrophic or keloidal scars involve excess tissue. Neither type is reversible with topical products alone.

If what you have is flat and discolored, you are dealing with a mark. If there is a visible depression or texture change that remains the same whether your skin is hydrated or not, that is structural. The interventions for each category are different by an order of magnitude.

Key takeaway

Press a finger firmly on the dark mark. If the color fully disappears (blanches), it is likely PIE: a vascular response, not pigmentation. If it stays dark, it is PIH. If there is texture you can feel as well as see, it may be structural scarring.

02PIE and PIH explained

Post-inflammatory erythema (PIE)

PIE is the pinkish or reddish flush that lingers after an inflamed pimple clears. The mechanism is vascular: the inflammatory response dilates and sometimes damages superficial capillaries, and that residual dilation reads as a red or pink mark. It is especially visible in lighter skin tones and in people prone to flushing or rosacea. PIE is technically not a pigmentation issue, which is why it responds better to vascular-targeting approaches (azelaic acid is a frequent recommendation) than to melanin-focused ones. It usually fades in 3 to 12 months without intervention, faster with.

Post-inflammatory hyperpigmentation (PIH)

PIH is the tan, brown, or grayish flat discoloration that results when inflammation triggers excess melanin production in the skin. The melanocytes respond to the injury signal by producing more melanin than usual, which gets deposited in the epidermis (and in deeper PIH, the dermis). PIH is more pronounced and longer-lasting in people with deeper skin tones, where there is more baseline melanin for the inflammatory cascade to amplify.[13] Without intervention, mild PIH fades in 3 to 6 months. Deeper or post-inflammatory PIH in higher Fitzpatrick skin types can persist for one to two years or longer. Daily SPF is essential: UV exposure re-stimulates melanogenesis and actively prolongs PIH.[12]

Key takeaway

Salicylic acid, while a well-studied active for clearing active acne, does not directly fade post-acne marks. Its contribution is upstream: by reducing inflammation and preventing new breakouts, it stops new marks from forming. The fading work belongs to niacinamide, retinol, and other actives discussed below.

03OTC ingredients with real evidence

This is where a lot of guides go wrong. Every ingredient sounds like it does everything. Here is a more honest read of what the evidence actually shows for post-acne marks:

Niacinamide (vitamin B3)

Niacinamide inhibits the transfer of melanosomes from melanocytes to keratinocytes, which is the key step that converts excess melanin production into visible darkening on the skin's surface. This mechanism is distinct from tyrosinase inhibition (the path that kojic acid and arbutin take), which gives niacinamide a different and complementary role in addressing the look of marks.[10] Clinical studies at 4 to 5% have shown statistically significant improvements in the appearance of hyperpigmentation. A 2019 study combining 3% tranexamic acid, 1% kojic acid, and 5% niacinamide showed improvements in post-inflammatory hyperpigmentation beginning at week 2 and continuing through week 12.[14] Niacinamide also works for broader hyperpigmentation concerns beyond just post-acne marks.

Retinol

Retinol accelerates epidermal cell turnover, which replaces pigmented surface keratinocytes and supports a more even-looking tone over time. It also inhibits the enzymes that degrade collagen in response to UV exposure, which helps support the appearance of skin texture and firmness.[2] A 52-week double-blind vehicle-controlled study using 0.1% stabilized retinol showed 44% improvement in crow's feet and 84% improvement in mottled pigmentation.[4] For post-acne pigmentation specifically, prescription-grade adapalene 0.3%/BPO 2.5% gel reduced atrophic scar counts by 15.5% over 24 weeks while the vehicle group saw a 14.4% increase, suggesting retinoids may also help prevent new scar formation.[9] You can read more about what retinol does for skin in our deeper guide.

Azelaic acid

Azelaic acid is particularly useful for PIE because it has both anti-inflammatory and melanin-modulating properties. It selectively targets overactive melanocytes (those producing excess melanin) while leaving normally functioning ones alone, which makes it a safer option for longer-term use and for those with sensitive or reactive skin. It is also one of the few topicals with evidence for use during pregnancy, which matters for some people.

Tranexamic acid

Emerging data on tranexamic acid for PIH is promising, particularly for melasma and post-inflammatory marks. The mechanism involves interrupting the UV-induced pathway between keratinocytes and melanocytes. Clinical evidence is growing but still less extensive than niacinamide or retinol, so this is best treated as a complementary rather than standalone approach.

Vitamin C

L-ascorbic acid inhibits tyrosinase and has antioxidant activity relevant to photoprotection. The clinical evidence is real but complicated by a significant stability problem: L-ascorbic acid oxidizes quickly and products can become ineffective long before they are used up. Formulations using more stable derivatives (sodium ascorbyl phosphate, ascorbyl glucoside, tetrahexyldecyl ascorbate) address this, though their conversion efficiency to active ascorbic acid varies. Useful, but the effective dose matters more here than for most actives.

Kojic acid and alpha-arbutin

Both inhibit tyrosinase activity and have clinical data supporting their use for PIH and melasma. Alpha-arbutin at 2.0 mM demonstrated more potent inhibitory activity on human tyrosinase than standard beta-arbutin and showed significant pigmentation reduction versus inactive controls in Fitzpatrick IV-V skin in a two-phase study.[11] Kojic acid increased skin brightness in 75% of participants in a small hyperspectral imaging study of post-acne discoloration.[15] Both are useful additions, especially in combination with niacinamide.

04Retinol for texture and uneven tone

Retinol works differently from brightening actives. Rather than directly blocking melanin transfer or synthesis, it drives cell renewal: the outer layers of skin turn over faster, which progressively replaces the pigmented cells that read as a dark mark. This is a slower process than tyrosinase inhibition, but it also improves the look of skin texture at the same time, making it especially useful when post-acne marks come with surface roughness or enlarged pores.

Retinol also stimulates the production of hyaluronic acid in the skin,[3] which supports the plumped appearance of skin that makes textural irregularities less noticeable. The combined effect on texture and tone is why retinol tends to outperform single-target brightening ingredients in head-to-head trials for overall appearance of post-acne skin.

One important flag: retinol does not fill atrophic pits. Studies on adapalene 0.3% (a prescription-adjacent retinoid with stronger activity than OTC retinol) showed about 50% of subjects had investigator-reported improvement in the appearance of atrophic scars at 24 weeks, but in moderate-to-deep pitting this reflects surface softening rather than structural rebuilding.[8] For those cases, the honest answer is a derm referral.

Key takeaway

MAXXING's Smooth Criminal retinol serum is formulated to support skin texture and the appearance of uneven tone, through consistent cell turnover. Use it in the evening, start 2 to 3 nights per week, and give it 8 to 12 weeks before judging results. It is not a scar eraser, but it is a strong OTC option for the marks and surface texture that follow breakouts.

05Niacinamide for the look of post-acne marks

Niacinamide sits in an unusual position in the skincare evidence hierarchy: it is well-tolerated by almost everyone, the mechanism for its effect on the look of hyperpigmentation is well understood, it multitasks across oil control, barrier support, and the appearance of pore size, and it stacks cleanly with retinol (typically morning niacinamide, evening retinol). The main risk is that high concentrations (above 10%) can cause flushing in some people and that, at very high zinc concentrations, some formulations have been associated with purging-adjacent reactions in acne-prone skin.

For post-acne marks specifically, the evidence supports 4 to 10% as the effective range. A serum combining niacinamide with salicylic acid, lactic acid, and HEPES in an 8-week split-face trial showed significant reduction in inflammatory lesions and improvement in pore appearance, reinforcing that the ingredient works well in combination.[16] MAXXING's Clear Dominance serum is built around niacinamide and supports the look of marks and pores through this pathway.

It pairs well with retinol in a morning/evening split, or can be layered (niacinamide first as a water-based step, retinol after), and both complement daily SPF as the foundation of any post-acne routine.

06How niacinamide serums compare

The table below compares key specs across the niacinamide category. Product names are anonymized; MAXXING's Clear Dominance is the highlighted row. Prices are as listed at major US retailers at the time of publication.

Niacinamide serum comparison: anonymized market data
Product Niacinamide % Zinc Key supporting actives Price / 30ml pH range Size
Brand A serum 10% Zinc PCA 1% Water-based, alcohol-free $6.00 5.0 to 6.5 30ml
Brand B serum 12% Zinc PCA 2% Sodium hyaluronate, vitamin E, glycerin $17.00 5.0 to 5.6 30ml
Brand C serum 15% Zinc PCA N-acetylglucosamine, allantoin, trehalose ~$37.50 per 30ml Not disclosed 20ml
Brand D serum 5% None Sodium hyaluronate, glycerin (10-ingredient formula) $40.00 Not disclosed 30ml
Brand E booster 10% None Licorice root, vitamin C (ascorbyl glucoside), acetyl glucosamine, CoQ10, EGCG, panthenol ~$73.50 per 30ml 6.0 to 7.0 20ml
MAXXING Clear Dominance MAXXING 10% Zinc PCA Niacinamide at clinically studied 10%, barrier-supportive base, formulated for post-acne marks and oil management trymaxxing.com Formulated for skin tolerance 30ml
Competitor data sourced from public product pages and Ulta Beauty listings, June 2026. Prices are approximate and may vary. Anonymized to focus on specs rather than brand competition. MAXXING pricing current at trymaxxing.com.

07Building a post-acne routine that actually works

The three pillars for fading post-acne marks are: an active that addresses pigmentation or cell turnover, consistent daily SPF, and patience. Without SPF, the other two work significantly harder for significantly less result.

Morning routine

  1. Gentle cleanser
  2. Niacinamide serum (10%, like Clear Dominance)
  3. Moisturizer
  4. SPF 30 or higher (the non-negotiable step)

Evening routine

  1. Cleanser
  2. Retinol serum (start 2 to 3 nights per week; see our full retinol guide for the intro protocol)
  3. Moisturizer

If you are using salicylic acid for active breakouts, it fits well as a toner or targeted treatment after cleansing. Its primary role is preventing new marks from forming by keeping pores clear and reducing inflammatory lesion counts.[1] That upstream work matters: the fewer new breakouts, the fewer new marks.

Key takeaway

Do not use retinol and salicylic acid at the same time of day if your skin is sensitive. They both increase cell turnover and combining them in the same step can cause irritation that actually slows healing. Morning salicylic acid, evening retinol is a safe and common split.

What to avoid

  • Picking or squeezing: this is the single biggest predictor of deep PIH and atrophic scar formation. The mechanical trauma drives more inflammation deeper into the dermis.
  • Skipping SPF: UV re-stimulates the melanin pathway and actively darkens existing PIH. A two-day sun exposure can undo weeks of fading work.
  • Expecting results in two weeks: the skin's natural turnover cycle is approximately 28 days, and rebuilding pigmentation takes multiple cycles. Eight to twelve weeks is the minimum meaningful assessment window for most actives.
  • Stacking multiple strong actives too fast: a compromised or irritated barrier produces more inflammation, which can worsen PIH. Introduce one new active at a time.

08When OTC is not enough

If what you have is true atrophic scarring (visible pits, texture that does not smooth out with moisture), topical products are not the right first-line answer. That is worth saying plainly because a lot of content in this space oversells what OTC actives can do for structural damage.

Dermatological options for atrophic acne scars include:

  • Microneedling: creates controlled micro-injuries that stimulate collagen production; requires multiple sessions
  • Subcision: a needle technique that breaks up the fibrous bands tethering rolling scars to the dermis below
  • Fractional laser (ablative and non-ablative): the most effective option for deep atrophic scarring, with the highest downtime
  • Chemical peels (medium-depth): glycolic or TCA peels can improve shallow atrophic scars and significantly help PIH
  • Filler: temporary volume restoration in boxcar or rolling scars

These procedures are not failures of skincare. They are the appropriate tools for the problem. A dermatologist assessment is valuable even if you ultimately start with OTC, because it gives you an honest picture of what you are actually working with. Some people treating what they think is PIH are actually dealing with melasma, which has a completely different management approach.

Copper peptides and microneedling for scar texture

For atrophic scars, the most useful supporting role copper peptides can play is alongside professional microneedling. Microneedling creates controlled micro-channels that prompt the skin to build collagen, and it also lets water-loving actives reach a little deeper. Copper peptides (Copper Tripeptide-1) are signaling peptides that support the skin's own repair and remodeling process, so applying a gentle copper peptide serum into the post-needling recovery window is a low-risk way to support the look of smoother, firmer texture as the skin settles. This supports appearance only and does not replace the procedure itself. For the full step-by-step, including timing and how to ramp up safely, see the copper peptide microneedling protocol.

Key takeaway

Retinol and niacinamide are genuinely useful for the marks that follow breakouts. They support the look of post-inflammatory pigmentation and texture over time, with real clinical evidence behind both. For structural pitting, the right move is a derm. Doing OTC well in the meantime keeps your skin in better condition for any procedure you later choose.

09Frequently asked questions

Acne marks are flat discolorations left after a pimple heals: PIE (post-inflammatory erythema) is the pinkish or reddish flush from dilated capillaries, and PIH (post-inflammatory hyperpigmentation) is the tan, brown, or grayish darkening from excess melanin. Both are temporary and fade with consistent skincare. True acne scars involve permanent changes to the skin's structure: atrophic pits (ice pick, rolling, boxcar), or raised hypertrophic or keloidal tissue. Topical products cannot fill or structurally rebuild pitted scars.

Without intervention, mild PIH can fade in 3 to 6 months. Deeper PIH, particularly in people with deeper skin tones where melanin is more concentrated, can take 12 to 24 months. PIE typically resolves faster than PIH but can persist for 6 to 12 months in some cases. Consistent use of niacinamide, retinol, and daily SPF meaningfully accelerates fading. Skipping SPF is the single biggest way to slow the process, since UV exposure actively worsens both types of marks.

Yes, with a clear mechanism: niacinamide inhibits the transfer of melanosomes from melanocytes to keratinocytes, which is the step that turns excess melanin production into visible darkening. Studies using 4 to 5% niacinamide show statistically significant improvements in the appearance of hyperpigmentation versus vehicle. Clinical results for visible marks are typically seen at 8 to 12 weeks of consistent twice-daily use. It also supports the skin barrier and manages excess oil, which helps prevent new breakouts from forming in the first place.

Retinol accelerates cell turnover, which helps replace pigmented surface keratinocytes and supports the appearance of a more even tone. For PIH, this is a meaningful benefit. Clinical studies using retinol show significant improvements in hyperpigmentation and skin texture over 8 to 12 weeks. For atrophic (pitted) scars, prescription-strength retinoids like adapalene 0.3% have shown measurable improvement in scar counts over 24 weeks in clinical trials, but OTC retinol at standard concentrations works more slowly and with more modest structural effect. For true atrophic scarring, retinol is better framed as a supportive maintenance ingredient than a primary treatment.

The strongest OTC options for the look of PIH and post-acne marks are: niacinamide (4 to 10%, well-tolerated, good evidence for melanosome transfer inhibition), retinol (supports cell turnover and pigmentation improvement, strongest evidence for combined texture and tone), azelaic acid (selectively targets overactive melanocytes, good for sensitive skin), and tranexamic acid (emerging evidence particularly for PIH and melasma). Vitamin C serums are widely used but stability varies. Kojic acid and alpha-arbutin have solid mechanistic and some clinical data. Hydroquinone is among the most studied but is not OTC in the US, EU, Japan, or Australia.

Not significantly. Atrophic scars involve permanent tissue loss in the dermis. Topical products cannot rebuild that structure. Adapalene 0.3% gel showed a 15.5% decrease in atrophic scar counts in one 24-week RCT, suggesting retinoids may help prevent new scar formation and slightly soften shallow ones over time. Meaningful improvement of established moderate-to-deep atrophic scars requires dermatological procedures: microneedling, subcision, fractional laser, chemical peels, filler, or combinations. A dermatologist assessment is worth getting first.

More than almost anything else. UV exposure stimulates melanogenesis (the melanin production pathway) and directly worsens PIH. Studies comparing hydroquinone with versus without SPF found 96% improvement with SPF versus 81% without it.[12] Every depigmenting ingredient works better under SPF. Daily SPF 30 or higher, rain or shine, is not optional when you are trying to fade post-acne marks.

PIE (post-inflammatory erythema) is the flat pink or red mark left after an inflamed pimple clears. The colour comes from dilated superficial blood vessels: it is technically a vascular response, not pigmentation. PIH (post-inflammatory hyperpigmentation) is the tan, brown, or grayish flat discoloration caused by excess melanin triggered by inflammation. A simple test: press a finger firmly on the mark. If the colour completely blanches under pressure, it is likely PIE. If it stays dark, it is likely PIH. PIE responds well to azelaic acid and niacinamide. PIH responds to niacinamide, retinol, vitamin C, and tyrosinase inhibitors.

It depends on the type. PIE and PIH (flat post-acne marks) can fade naturally over months, and OTC ingredients like niacinamide, retinol, azelaic acid, and daily SPF support the look of faster fading without procedures. True atrophic scars (pits, icepick, rolling, boxcar) involve structural tissue loss that topicals cannot rebuild. For pitted scars, a dermatologist consultation is the realistic path forward.

Flat post-acne marks (PIE and PIH) can fade to undetectable with consistent skincare and SPF, so effectively yes for most people. True atrophic pits are permanent structural changes to the dermis: they rarely go away completely without professional procedures like microneedling, fractional laser, or subcision. Treatments can significantly improve their appearance, but "100% gone" is not a realistic expectation for moderate-to-deep pitting without clinical intervention.

The same principles apply to back acne marks as to the face: PIH (dark spots) responds to niacinamide, retinol, and consistent SPF on exposed areas. The back is harder to reach and often covered by clothing, so SPF application is frequently skipped and marks can take longer to fade. For true atrophic back scarring, a dermatologist can assess whether procedures like microneedling or laser are appropriate for the area.

Habib A Muflih
Founder of MAXXING

Habib founded MAXXING to build evidence-informed skincare without the marketing fluff. Every article in this series is grounded in peer-reviewed literature, with honest calls on where evidence is strong versus where it is preliminary. You can find the full product line at trymaxxing.com and reach the team at @trymaxxing.

Last reviewed: June 2026. Citations linked to PubMed and open-access journals where available.

Related reading

References

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  2. Fisher GJ, et al. "Molecular mechanisms of photoaging in human skin in vivo and their prevention by all-trans retinoic acid." Photochemistry and Photobiology. 1999. PubMed
  3. Dong KK, et al. "Topical stabilized retinol treatment induces the expression of HAS genes and HA production in human skin in vitro and in vivo." Archives of Dermatological Research. 2017. PubMed
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  14. Farris PK, et al. "Effect of a Tranexamic Acid, Kojic Acid, and Niacinamide Containing Serum on Facial Dyschromia." Journal of Cosmetic Dermatology. 2019. PubMed
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(c) 2026 MAXXING LLC. All rights reserved. trymaxxing.com | @trymaxxing This content is for informational purposes only and does not constitute medical advice. Consult a licensed dermatologist for diagnosis and treatment of skin conditions.
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