Condition

Post-Inflammatory Hyperpigmentation

Post-inflammatory hyperpigmentation is the flat dark mark left behind after the skin has been inflamed — by a spot, a bite, a scratch, a burn or a rash. It is a colour change, not a scar.
At a Glance

Post-inflammatory hyperpigmentation, or PIH, is the brown, grey or purple mark left where skin was inflamed. The skin is flat and feels normal. It is pigment, not scarring, and it fades on its own — usually over three to twelve months.

The one thing that matters most: treat whatever is causing the inflammation first. If the acne is still breaking out or the eczema is still flaring, you are fading old marks while making new ones, and no cream wins that race.

It is far more common and far more persistent in brown and Black skin. Daily sunscreen is what decides how fast it fades — more than any fading cream. And aggressive treatment on deeper skin can create more pigment rather than less, which is why gentler and slower usually wins here.

Key Facts

How CommonVery common. It follows almost any inflammation of the skin, and it is one of the most frequent reasons people with deeper skin see a dermatologist.
Who Gets ItAll skin tones, but much more often and much more stubbornly in brown and Black skin. Anyone with acne, eczema, psoriasis, bites or injuries.
Chronic or CurableTemporary. It fades on its own — typically three to twelve months for surface pigment, longer if it sits deeper.
Rx RequiredNo for most. Prescription options exist for marks that are not shifting.
ContagiousNo.

Symptoms

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The defining feature of PIH is that nothing has changed except colour. Run a finger over it and the skin feels exactly like the skin next to it.

What it looks and feels like

A flat mark, level with the skin — no bump, no dip, no roughness. This is the single most useful check.
Brown, tan, grey or near-black — the deeper your natural tone, the darker the mark tends to be.
Shaped like whatever came before it — round where a spot was, a line where a scratch was, a patch where eczema sat.
Blurry, soft edges — unlike sun spots, which have a sharper border.
No symptoms — it does not itch, hurt or flake. If it does, the original problem is still active.
Slow, steady fading — it lightens over months, and it darkens again with sun exposure.

Where it shows up

  • The face, especially the cheeks, jawline and chin, where acne lands.
  • The legs and ankles, from bites, ingrown hairs and shaving.
  • The back and shoulders, after body acne.
  • The elbows, knees and creases, after eczema or psoriasis.
  • Anywhere the skin has been injured — cuts, burns, waxing, a reaction to a product.

How it looks on different skin tones

This is the difference that defines the condition. Skin with more active pigment cells makes more pigment in response to the same injury. A spot that leaves a faint pink mark for two weeks on fair skin routinely leaves a dark brown mark for eight months on brown or Black skin. In very deep skin the mark can look slate-grey or blue-black, which usually means the pigment has dropped into the deeper layer and will take a year or more rather than a few months. On lighter skin, what is left behind is more often red or purple than brown — that is post-inflammatory erythema, a different thing with different treatment. The practical consequence on deeper skin is the same throughout this page: preventing the mark is worth far more than treating it, and going in hard usually backfires.

Light
Medium
Brown
Deep

Several other things leave dark marks. See Lookalikes near the bottom of this page.

Causes & Risk Factors

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Pigment cells called melanocytes sit at the base of the outer layer of skin, making melanin — the pigment that gives skin its colour. When skin is inflamed, the chemicals released during that inflammation switch those cells into overdrive. They make extra melanin, and they hand it to the surrounding skin cells. That is the dark mark.

Where the pigment ends up decides how long it lasts. If it stays in the outer layer, it looks brown and clears in roughly three to twelve months as the skin turns over. If the inflammation was strong enough to damage the boundary between the layers, pigment falls into the deeper layer, where there is no turnover to carry it out. That pigment looks greyer or blue-black and can take years, or never fully go.

Which means two things drive how bad your marks are: how sensitive your pigment cells are, which is inherited, and how deep and how long the inflammation went, which is partly in your control. Picking and squeezing pushes inflammation deeper, and sun exposure tells the same cells to keep making pigment. That is why not picking and daily sunscreen outperform every cream on this page.

What Hurts and What Helps

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What Makes It Worse

  • Leaving the underlying problem untreated. This is the whole point. If acne keeps breaking out, or eczema keeps flaring, you make new marks faster than the old ones fade. No cream can outrun an active rash, and fading treatments started before the inflammation is controlled are largely wasted.
  • Sun. Every unprotected day tells those pigment cells to keep going, and it re-darkens marks that were on their way out. Two summer weeks can undo months.
  • Visible light, which ordinary sunscreen does not block. Daylight through a window and bright indoor light both drive pigment in medium and deep skin, which is why tinted sunscreens containing iron oxides are recommended for this specifically.
  • Picking and squeezing. Squeezing pushes inflammation deeper, and depth is what decides whether pigment lands in a layer that clears or a layer that does not.
  • Aggressive treatment. Strong peels, harsh scrubs, too many acids, a retinoid ramped up too fast, or the wrong laser. Each of these inflames the skin, and inflamed skin makes pigment. People finish courses of treatment darker than they started, and on deeper skin that new pigment can take a year to settle.
  • Heat and friction. Hot showers on the face, saunas, and rubbing at a mark to lift it.
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  • Judging progress in the mirror week by week. Fading is too gradual to see day to day, and giving up at week six is the most common way people never find out whether something was working.

Daily Habits That Help

  • Getting the cause under control first, properly. Whatever is inflaming the skin — acne, eczema, ingrown hairs, a reaction to a product — is the first treatment target, and often the only one that is needed.
  • Daily sunscreen, every day, all year, including indoors near windows. This does more than any fading ingredient and it costs the least. A tinted mineral sunscreen adds protection against visible light, which matters on brown and Black skin.
  • Not picking. A spot you leave alone often leaves no mark at all. There is no cream that outperforms this.
  • Being gentle and patient with actives. One at a time, introduced slowly, stopped if it stings. Calm skin fades faster than irritated skin, and irritation is the most common self-inflicted setback here.
  • Time, honestly measured. Surface marks take three to twelve months. Deeper grey-blue pigment takes a year or more and may not clear completely. Nothing on the market makes this fast.
  • Monthly photographs in the same light, at the same angle. This is how you actually tell whether treatment is working.
  • Treating red marks differently. If a mark blanches when you press it, it is widened blood vessels rather than pigment, and every fading cream on this page will do nothing for it.

Try at Home

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These help, but modestly. Use one at a time, give each three months, and keep in mind that none of them will outperform sun protection or getting the underlying inflammation under control.

Always
The most effective thing on this page, and the cheapest. Sun keeps telling the pigment cells to keep going, so unprotected days undo weeks of fading. Wear it daily, all year, whatever your skin tone.
Moderate evidence
Ordinary sunscreen blocks UV but not visible light, and visible light drives pigment in medium and deep skin. The iron oxides that give a tinted sunscreen its colour are what block it. Worth choosing tinted if your marks are stubborn.
Moderate evidence
One of the better options here because it does two jobs at once — it calms the acne or rosacea causing the marks and fades the marks themselves. Gentle enough for most skin, and safe in pregnancy.
Moderate evidence
Blocks pigment being handed from the pigment cell to the surrounding skin. Very well tolerated, which matters here — anything that irritates makes marks worse. Expect a gentle assist rather than a dramatic change.
Limited evidence
Interrupts the signal that tells pigment cells to switch on. Most of its evidence is in melasma, and it is used for post-acne marks by extension. Gentle, and reasonable to layer with niacinamide.
Limited evidence
Slows pigment production and adds some protection against daily light exposure. Popular and safe, though the strong forms can sting, and stinging is a step backwards here.
Limited evidence
A gentler relative of hydroquinone that blocks the same pigment-making enzyme, more weakly. Suits people who want a fading ingredient without a prescription and without irritation.
Moderate evidence
Speeds up how fast pigmented skin cells are shed, so marks clear sooner. Introduce it slowly — pushed too fast it irritates, and irritation on deeper skin makes new pigment.

When to See a Dermatologist

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Most PIH fades without a doctor. Book a visit if:

  • The inflammation causing it is not under control — that is the real appointment.
  • Six to twelve months have passed with sun protection and nothing has changed.
  • The marks look grey or blue-black rather than brown, which suggests deeper pigment and needs a different approach.
  • You are unsure whether you are looking at pigment, red marks or actual scarring, because all three are treated differently.
  • You want to use hydroquinone, which is best used in supervised cycles rather than indefinitely.
  • A dark patch is growing, changing shape or colour, or looks different from everything else on you.

What the visit gets you: treatment for the underlying condition, an honest read on how deep the pigment sits and therefore how long it will take, prescription-strength fading options, and — particularly on deeper skin — someone to talk you out of the aggressive treatment that would make it worse.

Prescription Treatments

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Prescription fading treatments are stronger and faster, and they are the point at which supervision starts to matter — particularly on deeper skin, where over-treating causes the exact problem you are treating.

Topical prescriptions
Strong evidence
The best-evidenced single prescription cream for these marks, and it treats the acne causing them at the same time. Build up slowly. Judge it at three to six months, not weeks. Not used in pregnancy.
Topical prescriptions
Strong evidence
The strongest fading ingredient available. It is used in cycles — typically three to four months on, then a break — rather than indefinitely, because long continuous use can cause a blue-black discoloration that is hard to reverse.
Topical prescriptions
Moderate evidence
Hydroquinone, a retinoid and a mild steroid in one cream. The steroid is there to reduce the irritation the other two cause, which is why it fades marks faster than any of them alone. Short courses only.
Pills and injections
Limited evidence
A tablet used off-label for stubborn pigment. Almost all the evidence behind it is in melasma rather than post-acne marks, so its role here is uncertain. It is avoided in anyone with a history of blood clots.

In-Office Treatments

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In-office options are for marks that have not shifted after months of proper home treatment. On brown and Black skin they carry real risk of making pigment worse, so they are approached cautiously and gently.

Moderate evidence
A light peel speeds up shedding of pigmented cells. Kept superficial and spaced out, especially on deeper skin — a peel that is too strong causes exactly the inflammation that made the marks in the first place.
Limited evidence
Fine needles create tiny channels to speed up skin renewal. It is one of the safer in-office options for deeper skin because it does not use heat or light, but the evidence for pigment specifically is limited.
Picosecond laser
Limited evidence
Shatters pigment with very short pulses, which puts less heat into the skin than older lasers. Reserved for marks that have not moved after months of proper home treatment, and used cautiously on deeper skin.

What to Expect

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Step 1
The first month

Usually no visible change at all, whatever you are using. Fading is slow by nature. This is normal and not a sign of failure.

Step 2
Months two to four

The first real lightening, if the original inflammation has stopped. If new marks are still appearing, that is the signal to go back and treat the cause rather than change your fading cream.

Step 3
Months three to twelve

Where most surface pigment clears. Brown marks on lighter skin sit at the shorter end, dark brown marks on deeper skin at the longer end.

Step 4
A year and beyond

Grey or blue-black marks, where pigment has dropped into the deeper layer, live here. These are slow, may only partly clear, and are the ones worth seeing someone about rather than treating at home.

Step 5
After it fades

Sun protection does not stop. The pigment cells that made the mark are still there and still reactive, and marks that have faded will darken again with unprotected sun.

Complications

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PIH itself is harmless. It does not damage skin and it does not turn into anything dangerous. The problems come from how it is treated and from what gets mistaken for it.

Making more pigment by treating too hard
The most common complication and entirely avoidable. Strong peels, harsh scrubs, over-used acids and the wrong laser inflame the skin, and inflamed skin — particularly brown and Black skin — responds by making pigment. Finishing a course of treatment darker than you started is a real and frequent outcome.
Laser on deeper skin tones
Devices that target pigment cannot always separate your mark from your natural colour. In experienced hands with the right settings this is manageable; in inexperienced hands it causes burns, patchy dark marks or permanent pale patches. Ask how often that person treats your skin tone.
Pale patches
Over-treating can strip pigment from the skin around the mark, leaving a light halo that is harder to correct than the original.
Ochronosis from long-term hydroquinone
Used continuously for many months, hydroquinone can cause a blue-black discoloration that is difficult to reverse. Uncommon, and the reason it is used in cycles with supervision.
Treating a scar as a mark
If the skin surface has actually changed — a dip you can feel, or a raised area — no fading cream will help, and months can be spent finding that out.
Missing something that is not PIH
A dark patch with no history of inflammation behind it, or one that is growing or changing, deserves to be looked at rather than faded.

Lookalikes

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Getting this right decides whether you need a fading cream, a laser, or nothing at all.

  • Post-inflammatory erythema — the other mark acne leaves, and the one most often mistreated. It is red, pink or purple, and it is widened blood vessels rather than pigment. Press it: red marks blanch under pressure, brown pigment does not. Every fading ingredient on this page does nothing for it. It settles with time, or with a vascular laser.
  • Acne scarring — a change in texture rather than colour. Look at your skin with light coming from the side: scars cast shadows, marks disappear. No cream reaches the layer where scars form.
  • Melasma — large, symmetrical, blurry patches on the cheeks, forehead and upper lip with no injury before them. Driven by hormones and light, it comes back, and it reacts badly to heat and aggressive lasers.
  • Sun spots (solar lentigines) — small, separate, sharply bordered spots on sun-exposed skin, appearing from the thirties onward. They do not fade on their own, unlike PIH, and they respond well to freezing and lasers.
  • Freckles — small, tan, present since childhood, darker in summer. They run in families.
  • Acanthosis nigricans — dark skin in the neck, armpits and groin that is also velvety and slightly thickened. It feels different from flat pigment and can be linked to insulin resistance.
  • Tinea versicolor — uneven patches on the chest, back and shoulders with a fine dusty scale. A yeast overgrowth, so it clears with antifungal treatment and not with fading creams.
  • Drug-induced pigmentation — grey or blue-grey discoloration linked to long-term medications such as minocycline. Worth raising if the colour looks unusual.
  • Melanoma — the one to rule out. A dark patch that is growing, uneven in colour or border, or clearly unlike your other marks needs looking at, not fading.
FAQ+
Is this a scar?Almost certainly not. PIH is flat and feels exactly like the skin around it. Scars are a change in texture — a dip or a raised area you can feel and see in side lighting. Marks fade; scars do not.
How long does it take to fade?Three to twelve months for most surface pigment. Marks that look grey or blue-black sit deeper and can take a year or more, and may not clear completely.
Why is mine taking so much longer than my friend's?Deeper skin makes more pigment in response to the same injury, and holds it longer. It is not that your treatment is failing.
Will a cream make it go faster?Somewhat. Fading ingredients speed things up by weeks to months, not overnight. Daily sunscreen and stopping the inflammation do more than any of them.
Why do my marks keep coming back?They are probably not the same marks. If the acne or eczema is still active, new marks are appearing as fast as the old ones fade. That is the sign to treat the cause harder.
Does exfoliating help?Gently and occasionally, yes. Aggressively, no — scrubbing and over-using acids inflame the skin, and inflamed skin makes more pigment. This is the most common way people make their own marks worse.
My marks are red, not brown. Same thing?No. Red or purple marks are post-inflammatory erythema, from widened blood vessels. Press it — if it blanches, it is not pigment, and fading creams will not touch it.
Is hydroquinone safe?Used in cycles under supervision, generally yes. Used continuously for many months it can cause ochronosis, a blue-black discoloration that is hard to reverse. It is not an ingredient to stay on indefinitely.
Should I get a laser?On lighter skin it is an option once the cause is controlled. On brown and Black skin, lasers aimed at pigment carry a real risk of causing more, and gentler approaches are usually the better trade. If you do go ahead, choose someone who treats your skin tone routinely.
Do I need sunscreen if I have dark skin?For this, yes — arguably more than anyone. Sun and visible light are what keep the marks dark, and PIH is the most common pigment complaint in deeper skin. A tinted mineral sunscreen adds protection against visible light that a clear one does not.
What about vitamin C, niacinamide and the rest?They help a little and they are safe. The trials behind them are small and short, so expect a modest speed-up rather than a transformation.
Can I prevent it?Largely, yes. Do not pick, treat flares early rather than waiting them out, and wear sunscreen. Most of the marks people spend a year fading were preventable in the week they formed.