Condition

Post-Inflammatory Hyperpigmentation

Post-inflammatory hyperpigmentation is the flat brown or gray mark left behind after a spot, rash or injury heals. It is not a scar, and given time and sun protection it fades.
Dr. Schwarz, MD · Board-certified dermatologistLast reviewed September 8, 2026
Close-up of the lower cheek, nose and mouth of a young person with medium-brown skin, turned three-quarters away from the camera against a pale blue background. Scattered flat dark brown marks are spread across the cheek, with a few small raised spots still active among them.

Start here

Dark marks are not scars. A scar is a dent or a raised line you can feel; these are flat, and flat marks fade — slower than anyone wants, but they fade. The fastest way to clear them is to treat whatever keeps making them, because every new acne spot, eczema flare or ingrown hair writes a new mark and no brightening cream keeps up. And do not pick — squeezing a spot pushes the inflammation sideways and turns a mark that would have lasted weeks into one that lasts months.

— Dr. Schwarz, Board Certified Dermatologist

Key Facts

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How commonVery common, and the single most common reason people with deeper skin tones come in about acne
Who gets itAnyone, after almost any inflammation of the skin. Far more frequent, darker and longer lasting in medium to deep skin tones
Curable or managedIt resolves. Most marks fade on their own, and treatment speeds that up
Prescription neededNot always. Over-the-counter treatment plus daily sun protection is enough for many people
Time to improveSurface marks usually fade over three to six months. Deeper, gray-toned marks can take a year or more

What It Is

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Post-inflammatory hyperpigmentation is the flat mark skin leaves behind after inflammation — pigment, after inflammation. The trigger might have been an acne spot, eczema, a bite, a burn, a cut, an ingrown hair or a reaction to a product.

The shape gives it away, not the color. The mark sits exactly where the original problem was and matches its outline — round marks after acne, a band after a scratch, a scattered pattern after a rash. Melasma, by contrast, forms broad symmetric patches with no rash before it.

Color tells you how deep the pigment sits. Tan and brown marks are near the surface and clear relatively quickly. Gray, slate or blue-brown marks sit in the deeper layer and are much slower, sometimes a year or longer. Most people have a mixture.

Two things get confused with it. A scar is a change in texture, raised or indented, and it does not resolve on its own. A flat pink or red mark after a spot is post-inflammatory erythema — a blood vessel change, not a pigment one, and it needs different treatment. This is flat, brown or gray, and temporary, even when temporary means a year.

Symptoms

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Dark marks where spots were

After Acne

Flat brown, gray or black marks left exactly where spots healed, with no dent or raised edge. They are marks, not scars, and they do fade, though it can take months. Sun exposure makes them last longer.
Marks in the shape of the trigger

After a Rash or Injury

Darkening in the outline of whatever caused it, such as eczema patches, a burn, a scratch or a reaction to a product. The shape is the clue to the cause. Preventing more inflammation is what stops more marks.
Gray-blue tint that lingers

Deep or Long-Standing

Marks with a gray or blue tone, which means the pigment sits deeper in the skin. These take much longer to fade than brown surface marks. They are more common in deeper skin tones and need gentler treatment, not stronger.

Where It Shows Up

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Front view of a head with red marks on both cheeks, along both sides of the jaw, on the chin and on the forehead.
Cheeks and jawline, where the acne was
Dark marks appear wherever the skin was inflamed, so they follow the cause rather than a set pattern. On the face that means the cheeks and the jawline, because that is where acne is. They fade on their own, but slowly, and deeper skin tones hold them longer.
Front view of a whole body with red marks across the upper chest, on both forearms and hands, across the bikini line and down both shins.
Chest, legs, arms and the bikini line
Marks turn up on the legs after bites, on the arms and hands after burns and cuts, and along the beard line and bikini line after ingrown hairs. Anywhere the skin was inflamed can leave one.
Back view of a whole body with red marks across the upper back and both shoulders. The rest of the body is clear.
Back and shoulders
The back and shoulders collect them for the same reason the chest does — it is where body acne sits, and spots there are often picked or rubbed by clothing, which deepens the mark that follows.

What Happens in the Skin

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This is what is going wrong under the skin, in the order it happens. Click a step to see it.

How Post-Inflammatory Hyperpigmentation happens
Skin basics
BARRIEREPIDERMISDERMISPIGMENT CELLMELANOCYTES0NORMAL SKIN1SOMETHING INFLAMES THE SKIN2PIGMENT CELLS SWITCH ON3EXTRA PIGMENT MADE, AND DROPPED DEEPER4SLOW CLEARANCE, UNDONE BY LIGHT

Pigment cells sit at the base of the top layer of skin and take their orders from the cells around them. With nothing inflamed, no chemical signal reaches them, so they hand out the same steady amount of pigment everywhere and the color stays even.

An acne spot, a patch of eczema, a bite, a burn, a scratch, an ingrown hair or a harsh cosmetic treatment sets off inflammation. The deeper and longer that inflammation runs, the more likely it is to leave a mark.

The chemical signals released by that inflammation reach the pigment cells sitting at the base of the top layer of skin and switch them on. How strongly they respond is inherited, which is why two people can have the same spot and only one is left with a mark.

The switched-on cells make extra melanin and pass it into the surrounding skin cells, which is the brown mark. If the inflammation damaged the junction with the layer below, some pigment falls through and is trapped there, and that is what looks gray or slate.

Surface pigment leaves as the top layer of skin turns over, which takes months, and deep pigment has to be carried away slowly with no shortcut. Ultraviolet and visible light switch the pigment cells back on partway through, which is why an unprotected summer can undo a whole spring of fading. Almost everything on the lists below is pushing on this step.

The outer film of dead cells and oil. It holds water in and keeps irritants out, and it is thinner than a sheet of paper. Almost every dry, itchy, stinging skin problem starts here.

The outer layer, and the only one anything in a jar reaches. It renews itself constantly: a cell made at the bottom takes about a month to reach the surface and flake off. Most of what a skincare product does, it does here.

The living layer underneath, holding the blood vessels, the nerves and the collagen. It is where lasting change happens and it is hard to reach: most of what is sold for the skin never gets this far.

Dark marks form in four steps. First, something inflames or injures the skin — an acne spot, eczema, a bite, a burn, a scratch, an ingrown hair, a harsh cosmetic treatment. Second, chemical signals from that inflammation reach the pigment cells at the base of the top layer of skin and switch them on.

Third, those cells make extra melanin and pass it into the surrounding skin cells. That is the brown mark. If the inflammation damaged the junction between the top layer of skin and the layer beneath, some pigment falls through into the deeper layer, where scavenger cells hold onto it — the gray, slate-toned marks that last so much longer.

Fourth is clearance, and it is slow. Surface pigment sheds as the top layer turns over, which is why brown marks fade over months. Deep pigment has no exit and must be carried away gradually. Ultraviolet and visible light re-activate the pigment cells and interrupt this step, which is why an unprotected summer can leave a mark as dark in September as it was in May.

Risk Factors

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Some people mark far more easily than others, mostly because their pigment cells are more reactive. What follows makes marks more likely and longer lasting.

Inherited
Deeper skin tone
The strongest factor by far. More active pigment cells respond harder to the same inflammation.
Other health conditions
Acne, especially the inflamed kind
Deep, red, painful spots mark far more often than blackheads and whiteheads.
Other health conditions
Eczema and other itchy rashes
Scratching adds inflammation, so marks often follow the scratch pattern rather than the rash.
Other health conditions
Other inflammatory skin conditions
Psoriasis, lichen planus and drug reactions leave pigment behind as they clear.
Habits & products
Picking and squeezing
Turns small inflammation into large. The most common reason a mark is worse than it had to be.
Habits & products
Friction
Waistbands, straps, tight collars and repeated rubbing mark the skin in the shape of the pressure.
Habits & products
Sun exposure
Does not cause the mark. It darkens it and drags out the fading.
Injuries & procedures
Injuries and burns
Cuts, scalds, friction burns and hot oil splashes all mark, which is why arms and hands are common sites.
Injuries & procedures
Insect bites
One bite can leave a mark that outlasts the itch by months, especially on the legs.
Injuries & procedures
Cosmetic procedures
Peels, lasers, waxing and laser hair removal inflame skin enough to mark it, especially at settings not matched to skin tone.

Course

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Fading is not a straight line. Marks lighten over winter and stall over summer if sun protection slips, and a photograph in the same light shows progress a mirror does not. What decides the course is whether new inflammation keeps happening — while acne or a rash is active, marks accumulate faster than they clear.

As the spot healsThe starting point
This is the mark at its darkest

A dark mark is darkest just as the original spot finishes healing. That is when people notice it and assume it is worsening, when it is starting from its peak.

First six weeksLittle visible change
Fading has begun, but it does not look like it

Nothing seems to change for about six weeks. It is fading predictably, just too slowly to see day to day.

Three to six monthsBrown, surface-level marks
Clear lightening for most

Brown marks lighten noticeably over three to six months. A photograph taken three months earlier shows obvious improvement.

Around one yearBrown, surface-level marks
Often clear by now

Brown, surface-level marks often clear within a year, provided no new inflammation arrives in the same place.

A year or moreGray or slate-toned marks
The deeper marks take longest

Where pigment settled deeper, marks commonly take a year or more, and a few persist for years.

What Makes It Better & Worse

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Dark marks are four problems at once — inflammation or injury, pigment cells switched on, extra pigment made and dropped deeper, and slow clearance that light interrupts. Nearly everything that makes marks worse is a form of extra inflammation, so anything that leaves skin red, sore or peeling adds to it.

What is driving yours?

FATPIGMENT CELLMELANOCYTESBARRIEREPIDERMISDERMIS

An acne spot, a patch of eczema, a bite, a burn, a scratch, an ingrown hair or a harsh cosmetic treatment sets off inflammation. The deeper and longer that inflammation runs, the more likely it is to leave a mark.

The chemical signals released by that inflammation reach the pigment cells sitting at the base of the top layer of skin and switch them on. How strongly they respond is inherited, which is why two people can have the same spot and only one is left with a mark.

The switched-on cells make extra melanin and pass it into the surrounding skin cells, which is the brown mark. If the inflammation damaged the junction with the layer below, some pigment falls through and is trapped there, and that is what looks gray or slate.

Surface pigment leaves as the top layer of skin turns over, which takes months, and deep pigment has to be carried away slowly with no shortcut. Ultraviolet and visible light switch the pigment cells back on partway through, which is why an unprotected summer can undo a whole spring of fading. Almost everything on the lists below is pushing on this step.

What helps

  • Treat what caused it first The highest-value step, most often skipped.
  • Keep the barrier healthy Calm skin makes less pigment; irritated skin more.
  • Leave the spot alone while it heals Not picking beats most products here.

What makes it worse

  • Picking and squeezing The largest avoidable cause. Pushes inflammation deeper.
  • Leaving the underlying cause untreated Every new spot writes a mark.
  • Scrubbing and stacking strong actives Irritation is inflammation, which is step one.
  • Aggressive peels and lasers Treatment aimed at marks can cause a fresh round.
  • Hair removal over inflamed skin Adds inflammation where the marks are.
  • Friction and pressure Tight straps and rubbing keep inflammation going.
  • Unsupervised skin lightening creams Months of use cause lasting discoloration.
  • Stopping acne treatment when spots clear Marks are still fading, and the acne returns.
  • Judging it week to week Switching products every few weeks ends up irritating.

What helps

  • A tinted mineral sunscreen every day Iron oxides block visible light, which re-darkens marks.
  • Azelaic acid Calms pigment cells and inflammation, and is gentle long term.
  • Niacinamide Reduces pigment passed into surrounding skin cells.
  • Vitamin C, kojic acid, tranexamic acid Useful additions, not the backbone.

What makes it worse

  • Sun without protection Re-activates pigment cells in a fading mark.

What helps

  • A retinoid at night Sheds pigmented surface cells faster and treats acne.
  • Hydroquinone in a short course The strongest topical for stubborn brown marks.
  • Cysteamine An over-the-counter short contact treatment; cuts pigment production.

What helps

  • Gentle chemical peels A series of light peels speeds surface clearing.
  • Give it months, and take photographs Same light every four weeks is the only reliable check.

Your Routine

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Good skincare advice is hard to find. This routine is built on treatments with real evidence behind them, not on whatever happens to be trending.

Post-Inflammatory Hyperpigmentation
Post-Inflammatory Hyperpigmentation
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PM
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How These Treatments Work

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Treatments for Post-Inflammatory Hyperpigmentation do not all work in the same place. Tap one to see where it acts.

Pick a treatment
Skin basics
BARRIEREPIDERMISDERMISPIGMENT CELLMELANOCYTESSTOPS THE TRIGGERBLOCKS LIGHT REACHING SKINSLOWS PIGMENT MAKINGSPEEDS PIGMENT OUTREACHES DEEPER PIGMENTIT FADES ON ITS OWN

Inflammation is what switched the pigment cells on. The mark cannot fade while the acne or rash keeps flaring.

Light darkens the mark while it is trying to fade, which is why marks last longer over a summer.

Slows the enzyme the cell uses to make pigment, so less new pigment reaches the surface.

Moves the top layer along faster, so pigment already made sheds sooner.

For pigment sitting too deep for creams. Used carefully in deeper skin tones, where they can leave a new mark.

Surface marks fade over months. Deeper ones can take a year or more.

The outer film of dead cells and oil. It holds water in and keeps irritants out, and it is thinner than a sheet of paper. Almost every dry, itchy, stinging skin problem starts here.

The outer layer, and the only one anything in a jar reaches. It renews itself constantly: a cell made at the bottom takes about a month to reach the surface and flake off. Most of what a skincare product does, it does here.

The living layer underneath, holding the blood vessels, the nerves and the collagen. It is where lasting change happens and it is hard to reach: most of what is sold for the skin never gets this far.

Over-the-Counter Products

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Everything here you can buy without seeing anyone.

Tinted mineral sunscreen
Tinted mineral sunscreen
Strong evidence
The single most useful product for marks you already have, not just for preventing new ones. Ultraviolet and visible light both re-activate the pigment cells in a fading mark, and the iron oxides that make a mineral sunscreen tinted are what block the visible light. Wear it every day, including indoors near windows and through winter, or the fading you have earned gets undone.
Five azelaic acid tubes and bottles on white, most marked 10 percent, from Peach Slices, Paula's Choice, Facetheory, The Ordinary and NaturiumDiagram: how Azelaic Acid 15% (Finacea) works in the skin
Strong evidence
The best all-rounder here, because it calms inflammation and quietens overactive pigment cells at the same time, which means it treats the marks and the acne producing them. It is gentle enough to use for the many months this takes, and it suits deeper skin tones well. Expect slow, steady lightening rather than a quick change.
Six retinol products lined up, including SkinCeuticals Retinol 0.5, Murad, CeraVe, First Aid Beauty, RoC and Replenix16:9 hero for Retinol. Never cropped: the tone strip and the corner logo depend on the full frame.
Moderate evidence
Speeds up how fast the top layer of skin turns over, which is the route surface pigment leaves by, and it treats acne while it does so. Start two nights a week and build up, because irritation is inflammation and inflammation is what made the mark. Use it at night and pair it with sunscreen in the morning.
Six niacinamide products on white, including The Ordinary 10% + Zinc 1%, Paula's Choice Booster and EltaMD UV ClearLabeled cutaway diagram of a single skin pore, headed Niacinamide. The epidermis is a brick-textured band across the top and the dermis is pink below it, with a yellow oil gland at the base of the pore and a small cluster of bacteria inside it. Two callout lines point in: decreases inflammation is drawn in dark navy as the main effect, and decreases oil production is drawn in gray as a lesser one. Nothing points at the dead cells blocking the pore.
Moderate evidence
Works one step later in the chain than most brightening ingredients: it reduces how much pigment gets passed from the pigment cells into the surrounding skin cells. It is mild, it rarely irritates, and it layers with almost anything. On its own it is a supporting player rather than the backbone of a plan.
Six vitamin C products on white, including La Roche-Posay, L'Oréal Revitalift, CeraVe, Vanicream, bliss and Olay16:9 hero for Vitamin C (L-Ascorbic Acid). Never cropped: the tone strip and the corner logo depend on the full frame.
Moderate evidence
Slows one of the enzymes that makes pigment, and adds some protection against the light that re-darkens marks, which is why it is used in the morning under sunscreen. It is a useful addition rather than the main treatment. Higher strengths sting and can irritate, and irritated skin makes more pigment, so gentler is often better here.
Four cysteamine products: a Senté tube, an Omic+ cream and box, a 5% cysteamine serum dropper and a Cyspera bottle16:9 hero for Cysteamine. Never cropped: the tone strip and the corner logo depend on the full frame.
Moderate evidence
An over-the-counter option for stubborn brown marks, applied for a short contact time and then washed off, so it is a step rather than a leave-on product. It is the closest thing available without a prescription to a strong pigment treatment. The smell is unpleasant and some people find it stings, which is the usual reason people stop.
Four glycolic acid toner and liquid bottles lined up on white, one with its box16:9 hero for Glycolic Acid. Never cropped: the tone strip and the corner logo depend on the full frame.
Moderate evidence
Loosens the pigmented cells at the surface so they shed sooner, which helps brown marks more than gray ones. A low-strength product two or three nights a week is plenty. Stacking it with a retinoid on the same night is the classic way people end up red and peeling, which adds inflammation and slows everything down.
Five serums lined up on white, labeled tranexamic acid or niacinamide with TXA, including SkinCeuticals Discoloration Defense16:9 hero for Tranexamic Acid. Never cropped: the tone strip and the corner logo depend on the full frame.
Limited evidence
Interrupts the messages inflammation sends to pigment cells, and it is well studied in melasma with far less evidence in dark marks specifically. It is gentle and easy to add to a routine that is already working. Treat it as an extra rather than a replacement for sunscreen and azelaic acid.
Four alpha arbutin products lined up on white: three dropper serums and a pink cream tube16:9 hero for Alpha Arbutin. Never cropped: the tone strip and the corner logo depend on the full frame.
Limited evidence
A mild pigment blocker that is popular because it rarely irritates, which matters on skin that marks easily. The trade-off is that it works slowly and modestly, and most of the research is laboratory work rather than trials in dark marks. Reasonable to include, not something to build a plan around.
Five kojic acid products on white, including a turmeric serum, Medicube capsule cream, Admire My Skin and Seoul Ceuticals16:9 hero for Kojic Acid. Never cropped: the tone strip and the corner logo depend on the full frame.
Limited evidence
Another mild pigment blocker, usually found combined with other brightening ingredients rather than on its own. Evidence in dark marks is thin, and it causes contact allergy more often than the alternatives. If a product containing it makes the skin red or itchy, stop, because that irritation will darken the mark further.
Scrubs and exfoliating pads
Scrubs and exfoliating pads
Weak evidence
Surface pigment sits inside living skin cells rather than on top of the skin, and deep pigment sits below where any scrub can reach, so there is nothing to rub off. Scrubbing adds inflammation, and inflammation is step one of the whole process. This is one of the most common ways a mark is made worse while trying to fix it.

Prescriptions

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These need a prescription.

16:9 hero for Hydroquinone 4%. Never cropped: the tone strip and the corner logo depend on the full frame.Diagram: how Hydroquinone 4% works in the skin
Strong evidence
The most powerful topical option for stubborn brown marks, used as a short course of around three months rather than continuously. It blocks the enzyme that makes pigment, so it lightens the mark without touching the cause. Long unsupervised use is what leads to ochronosis, which is why this is prescribed and reviewed rather than bought and forgotten.
A plain white medicine tube lying at an angle on a white background, capped, labeled Tretinoin in black with a navy blue swoosh curving along its length.Diagram: how Tretinoin works in the skin
Strong evidence
Sheds pigmented surface cells faster and treats the acne writing new marks, which is why it does two jobs on this page. It is stronger than an over-the-counter retinol and correspondingly more irritating at first. Build up slowly, because the peeling, stinging phase is inflammation and can darken the marks before it lightens them.
A white cream tube lying on its side on a white background, with a plain white label reading Triple Combination and a blue swoosh beneath it.
Triple combination cream
Moderate evidence
Hydroquinone, a retinoid and a mild steroid in one cream, used in short supervised courses for marks that have not moved on simpler treatment. The three parts block pigment, speed up shedding and calm the irritation the other two cause. It is not a long-term product: months of continuous use thins the skin and can cause its own discoloration.
16:9 hero for Azelaic Acid 15% (Finacea). Never cropped: the tone strip and the corner logo depend on the full frame.Diagram: how Azelaic Acid 15% (Finacea) works in the skin
Moderate evidence
The prescription strength of the same ingredient, worth asking about when the over-the-counter version has helped but not enough. It remains one of the few options that is both effective and gentle enough for continuous use on skin that marks easily. It is often the choice when hydroquinone is not wanted or the course has ended.
16:9 hero for Tazarotene. Never cropped: the tone strip and the corner logo depend on the full frame.Diagram: how Tazarotene works in the skin
Moderate evidence
The strongest of the topical retinoids, and it has been studied specifically in dark marks from acne on deeper skin tones. It works the same way as tretinoin but irritates more, so it is usually a second choice rather than a first. Ask your doctor before using any retinoid if you are pregnant or trying to be.

Procedures

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These are done in the office, usually over several visits.

A small clear glass bowl holding a shallow pool of pale amber liquid on a white background, with a white fan-shaped brush lying beside it, bristles resting against the bowl.Diagram: how Chemical Peel works in the skin
Moderate evidence
A series of light peels speeds up the shedding of surface pigment, so it helps brown marks far more than gray ones. Done gently and spaced out, it adds to a good home routine rather than replacing it. Done too strongly, especially on deeper skin tones, the peel itself inflames the skin and creates a fresh round of marks.
A gloved hand guiding a laser handpiece along a patient's lower leg16:9 hero for Nd:YAG Laser. Never cropped: the tone strip and the corner logo depend on the full frame.
Limited evidence
Low-energy 1064 nm treatment is the laser most often chosen for pigment in deeper skin tones, because that wavelength passes through the surface and reaches the deeper, gray-toned pigment. Several sessions are needed and results are modest. Settings matter more than the machine, and this should be done by someone who treats your skin tone regularly.
A gloved hand holding a picosecond laser handpiece against a woman's cheek as she lies on a treatment bed16:9 hero for Picosecond Laser. Never cropped: the tone strip and the corner logo depend on the full frame.
Limited evidence
Breaks pigment into fragments small enough for the body to carry away, using very short pulses that put less heat into the skin than older lasers. It is one of the safer device options for stubborn deep marks, but the evidence in dark marks after inflammation is still thin. Test patch first, and expect a course rather than one session.
16:9 hero for Microneedling. Never cropped: the tone strip and the corner logo depend on the full frame.Diagram: how Microneedling works in the skin
Limited evidence
Fine needles make controlled channels that help topical treatments penetrate and encourage the skin to remodel. It is mainly a scarring treatment, and its effect on pigment alone is small. It is a reasonable choice when true scars and dark marks sit together, but it can inflame reactive skin, so conservative depths are used on deeper skin tones.
16:9 hero for IPL (Intense Pulsed Light). Never cropped: the tone strip and the corner logo depend on the full frame.
IPL (Intense Pulsed Light)
Weak evidence
Broad-spectrum light aimed at surface pigment, and it is a poor fit for these marks. It is absorbed strongly by pigment throughout the skin, so on medium and deep skin tones it can burn and leave a darker or patchier result than it started with. It is used far more for sun spots on fair skin than for anything on this page.
16:9 hero for Microdermabrasion. Never cropped: the tone strip and the corner logo depend on the full frame.Diagram: how Microdermabrasion works in the skin
Weak evidence
Sands off the very top of the skin, which is above where the pigment actually sits, so it does little for brown marks and nothing for gray ones. Repeated sessions add friction and inflammation to skin that marks easily. Money spent here is better spent on daily sunscreen and a treatment that reaches the pigment cells.

When to See a Dermatologist

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Go in while the marks are still arriving, not after. If new spots or flares keep coming, treating the marks alone gets you nowhere, and the treatments that reliably stop acne, eczema or folliculitis are mostly prescription-only. Book if six months of over-the-counter treatment plus daily sun protection has changed nothing, if the marks are gray or slate rather than brown, if any mark is raised, indented, itchy, growing or changing rather than flat and stable, if the pigment appeared with no rash or spot before it, or if a cosmetic treatment left you darker than you started. No test is needed when something clearly came first and the mark matches its shape, though a Wood's lamp or a lit magnifier can show how deep the pigment sits, which mostly sets expectations about how long clearing takes.

— Dr. Schwarz, Board Certified Dermatologist

Complications

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Lookalikes

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Melasma

Both are flat brown patches on the face, and both darken in the sun. Melasma forms broad, symmetric patches with soft edges across the cheeks, forehead and upper lip, and there was no spot or rash in that place first. Dark marks are the opposite: they match the outline of whatever came before them, so they are round after acne and streaky after a scratch. Some people have both at once.

Acne Scarring

This is the mix-up that matters most, because most people call both of them scars. The test is touch, not color. A scar is a change in the surface, a dent or a raised lump you can feel, and it does not resolve on its own. A dark mark is completely flat and it fades. Many people have both in the same cheek, and a scar can be discolored as well, so it is worth checking each mark with a fingertip.

Sun Spots (Solar Lentigines)

Both are flat brown marks, and on the hands and forearms they are easy to confuse. Sun spots have sharp, well-defined edges, appear only where the sun reaches, build up slowly over years, and do not fade. Dark marks appear within days of something inflaming that exact spot, and they clear over months. Nothing came before a sun spot.

Myths

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  • "Those are acne scars." Usually not A scar changes texture, raised or indented, and does not resolve. A flat brown or gray mark is pigment, and pigment fades. Scars need different treatment.
  • "Lemon juice, toothpaste or baking soda will lighten it." These irritate the skin, and irritation is the inflammation that caused the mark. Lemon juice plus sunlight can cause its own burn and its own lasting pigment.
  • "It is never going to go away." Almost all of these marks go, but in months rather than weeks, and gray-toned marks can take a year or more. Slow is not permanent.
  • "Sunscreen only matters for preventing new marks." Sun re-darkens marks that are already fading. Daily sun protection does more for a mark you already have than most products.
  • "A stronger lightening cream will work faster." Past a point, strength buys irritation rather than speed, and irritated skin makes more pigment. Consistency with a moderate product beats bursts of a strong one.
  • "Exfoliating harder will scrub it off." Surface pigment sits inside living skin cells, not on the surface, and deep pigment sits below anything a scrub reaches. Scrubbing adds inflammation without removing pigment.
  • "Only people with deeper skin tones get this." Far more common and more visible in deeper skin tones, but anyone can get it. On lighter skin the same spot more often leaves a flat red mark, a different problem.

Questions Patients Ask

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How long will these take to fade?

Brown, surface-level marks lighten noticeably over three to six months and are often gone within a year. Gray or slate marks sit deeper and take a year or longer. Sun protection stops those timelines stretching.

Is this a scar?

Only if you can feel it. Scars are raised or indented and never resolve. Flat brown or gray marks are pigment, and they fade. Calling both scars sends people after the wrong treatment.

What is the single most useful thing I can do?

Stop the next mark forming. Treat the acne, eczema or ingrown hairs properly, do not pick, and wear tinted sunscreen daily. Those three beat any brightening product.

Why do my marks look red instead of brown?

That is post-inflammatory erythema — a blood vessel change, not pigment. Commoner on lighter skin tones, usually fades on its own, and pigment-lightening products do not help. Different problem, different plan.

Will a laser or a peel clear them faster?

Sometimes, and sometimes they make it worse. Gentle, well-chosen treatments speed up surface pigment. Aggressive ones inflame the skin and cause fresh marks, a real risk on deeper skin tones. Keep any device treatment conservative, with someone who treats your skin tone regularly.

Should I stop my acne treatment now that the spots are gone and only marks are left?

No. Stopping usually brings the acne back within months, and every new spot adds a mark. Most acne treatments also fade the marks, so continuing does both jobs.

References

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