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Understanding Post-Acne Marks

The flat brown, dark or reddish marks left after a spot heals are usually not scars but colour left by inflammation (PIH or PIE). They are more common and last longer on brown skin, yet most fade slowly with time. Daily sunscreen and fewer new breakouts help most; there is no guarantee how fast they fade.

Written by the Oliareen editorial teamDermatologist review: pendingLast updated: 6 November 2026How we write

What it is

Inflammation makes skin produce extra melanin, and that colour stays a while after the spot heals. This is post-inflammatory hyperpigmentation (PIH). On lighter skin a reddish mark (PIE) can stay, from blood vessels. Both are flat: the skin feels even under a finger.

What can contribute

  • The more inflamed the spot, the darker the mark can be.
  • Picking and squeezing.
  • Sun: UV and visible light deepen marks and make them last.
  • Irritation from harsh scrubs, too much acid or home remedies can create new marks.

Mark or scar: what it can look like

  • Flat, brown to dark, where a spot used to be: usually resembles PIH.
  • Flat, red-pink: resembles PIE.
  • Skin dipped or pitted, felt under a finger: that is a scar, a separate topic.
  • Even, spread patches on both cheeks that do not match spot sites: may resemble melasma or something else.

What not to assume

  • A mark is not necessarily permanent. Most PIH fades over months on its own.
  • No cream "erases" marks. Ingredients can at best speed fading somewhat.
  • Changing your natural skin colour is not the goal; only helping the mark match the skin around it.

Common mistakes

  • Using mark serums without sunscreen.
  • Stacking acids for fast results; irritation then makes new marks.
  • "Spot removal" or "fairness" creams of unknown origin, which may hide steroids, hydroquinone or mercury.
  • Chasing marks without first reducing new breakouts.

General skincare support

  • Sunscreen every day, cloudy days too. A review found it the most effective step for prevention.
  • Reducing new breakouts so fewer new marks form.
  • A gentle routine without irritation.
  • Patience: measurable change usually takes 8–12 weeks, full fading months to years.

Ingredient evidence and limits

These ingredients have some evidence, mostly from small studies. None guarantees a result, and all work less without sunscreen.

A systematic review found complete clearing of PIH was uncommon with most treatments, so keep expectations realistic.

When to see a dermatologist

  • Marks are very dark, widespread or upsetting; a doctor can discuss prescriptions or procedures.
  • You are not sure whether it is a mark, a scar or melasma.
  • Active acne is still not under control.

Simple routine

Morning

  1. 1
    Gentle cleanser, or just water

    If your face is not very oily after the night, water alone is fine in the morning.

  2. 2
    Light moisturiser (gel or lotion)

    Helps skin hold water; lighter textures feel better in the heat.

  3. 3
    Sunscreen SPF 30 or higher, every day

    This step has the strongest evidence for marks; without it, little else works well.

Evening

  1. 1
    Gentle cleanser

    Lifts the day's sweat, dust and sunscreen; no scrubbing needed.

  2. 2
    One active for marks, started slowly

    For example azelaic acid or niacinamide; one at a time, patch test first.

  3. 3
    Light moisturiser (gel or lotion)

    Helps skin hold water; lighter textures feel better in the heat.

General education, not a diagnosis or treatment plan.

Questions people ask

How long do acne marks take to fade?

Flat marks usually fade slowly over months to a year or two; brown skin can take longer. Daily sunscreen helps shorten this. No one can promise an exact time.

How do I tell a mark from a scar?

Run a finger over it. If it feels level, it is a colour mark; if it dips or rises, it is a scar. Cosmetics do very little for scars.

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Sources

  1. DermNet — Postinflammatory hyperpigmentation
  2. Mar K et al. Treatment of post-inflammatory hyperpigmentation: a systematic review. J Cutan Med Surg 2024
  3. Mar K et al. Prevention of post-inflammatory hyperpigmentation: a systematic review. Australas J Dermatol 2025
  4. Davis EC, Callender VD. Postinflammatory hyperpigmentation in skin of color. J Clin Aesthet Dermatol 2010
  5. Bissett DL et al. Niacinamide and pigmentation, 12-week split-face study (2005)