What it is
They are not scars — the surface of the skin is intact and the color fades on its own, but slowly. Treatment means finding and stopping whatever is still inflaming the skin, then supporting the fading with prescribed topicals and daily sun protection, keeping any procedure deliberately gentle.
What this page covers
- Post-inflammatory hyperpigmentation management, with the trigger named and treated first
- Post-inflammatory hyperpigmentation as the presenting complaint in acne, before scar work
- Separating post-inflammatory erythema (flat red marks) from brown pigment, because they need different treatment
- Frictional melanosis from loofah scrubbing, tight clothing and habitual rubbing
- Post-cupping and post-cautery pigmentation and scarring
- Black henna and PPD allergic contact dermatitis
- Pigmented contact dermatitis (Riehl's melanosis) with patch testing
- Underarm, groin, knee and elbow darkening, after excluding steroid-modified tinea with a scraping and acanthosis nigricans with a metabolic assessment
- Acne mechanica and folliculitis under a prolonged face covering
- Post-inflammatory hyperpigmentation risk assessment before any device, peel or needling
- Pre-treatment priming and photoprotection protocol
- Test spot before laser or peel on skin of color
- Post-procedure pigmentation rescue protocol, including for treatment done elsewhere
- Management of device complications: burn, blister, dyspigmentation
- Post-inflammatory and post-procedure hypopigmentation
- Topical retinoids, azelaic acid, niacinamide and other pigment-directed topicals
- Gentle superficial peels and conservative microneedling once the skin is calm
Who it suits
- Someone whose trigger has stopped: a spot that came and healed, an eczema patch that has calmed, an insect bite, an ingrown hair, the line left by threading or waxing, or the round marks of cupping. What remains is color to be followed and helped along rather than attacked
- Someone still breaking out who has come about the marks. We start with the acne itself: every new spot rebuilds the mark, and pigment-directed treatment over continuing inflammation irritates more than it lightens. The route begins at acne
- Someone who has been using a lightening cream or an unlabeled mixture and wants to know what it has actually done to her skin. Bring it with you in its own container, as it is
- Someone whose skin darkened after a device session or a peel, here or elsewhere. Bring what you know about that session: the device, the settings if you were given them, and the date
- Not you if the marks are flat and pink or red rather than brown. Those are dilated vessels rather than pigment, lightening creams do nothing for them, and they take a different route. And if you can feel a dip or an unevenness in the surface with your finger, that is a scar rather than color — see acne scars
When we advise delaying or not treating
- Skin that is still inflamed. Active acne, an eczema flare, folliculitis: the cause is treated first. Nothing fades over inflammation that is still running, and each new lesion rebuilds the mark from the beginning
- Darkening in a fold that itches, scales, or has an active spreading edge — the underarm, the groin, under the breast, between the thighs. It is treated as fungal until a scraping and a microscope say otherwise, particularly where a mixed or unlabeled cream has been used. Lightening on top of a fungal rash spreads it, blurs its border, and deepens the color
- Velvety darkening that is thickening at the neck, underarms, groin or knuckles. This is a sign of something in the body before it is a question of color: it is assessed metabolically, with a blood sugar check, rather than lasered. The color returns while its cause underneath continues
- A lightening mixture or a cream of unknown contents on the area. It is stopped, but on a plan and with a taper, and not on your own: many of them contain a steroid, and stopping one abruptly flares the skin, so the new treatment gets the blame. Skin thinned underneath it is brought back to baseline before any peel or device. Bring the container as it is
- Unregulated lightening products. Those containing mercury or high strengths are not used here and are stopped; their chemical burns leave pale marks that are harder to treat than the darkening they were bought for
- Recent sun exposure or an active tan, or an area threaded, waxed or sugared in the preceding days. That is a reason to postpone a peel or a device rather than to soften its settings, and it is asked before every session rather than only at the first
- Pregnancy and breastfeeding. Some pigment-directed topicals are not used then, topical retinoids among them. Tell us before the prescription is written rather than afterwards; what can be used remains, decided together with the doctor looking after you
- Diabetes that is not well controlled, before anything that breaks the skin such as a peel or needling: healing is slower and the risk of infection is higher. Deferring until control improves is care rather than refusal, and it comes with an appointment to come back to
- A request to laser a mark that is still active. We decline it. Continuing laser or aggressive lightening through active pigmentation usually deepens it, and waiting here is a treatment decision rather than a delay
- A request to have it finished by a date — a wedding, Eid, or travel. We decline that too. Fading is measured in months, and compressing it into weeks is itself what leaves the skin darker. What can be done before the occasion is something else: settling whatever is inflamed, a simple routine, and sun protection
- A request to lighten skin that is simply its own color. The underarm, groin, knee and elbow are naturally deeper in tone in many people, and that is not a disease. And where the request is coming from family or marital pressure rather than from you, we say so plainly and the conversation changes. Intimate lightening is not offered to adolescents
Possible effects
Stated in full, because the decision is not sound without them:
- Irritation from the topicals themselves: stinging, redness, dryness and flaking. On this skin the irritation turns into color of its own, which is why they are started low and built slowly, and why "more and stronger" is the commonest way people deepen their own marks
- A peel taken deeper than the skin can take, needling before the skin is calm, or sessions too close together: any of them can leave the area darker than the marks they were meant to treat
- A stubborn slate-gray or blue-gray darkening after long, unsupervised use of hydroquinone-containing creams. It is difficult to treat, it worsens with further lightening, and it is reported more often in darker skin
- Loss of color in places, meaning patches paler than the skin around them: harder than darkening, slower to change, and the color may not even out. Aggressive lasering of flexural skin, and chemical burns from unregulated lightening creams, leave the same kind of mark
- Infection on a surface that has just been broken by a peel or needling, or reactivation of cold sores around the mouth in someone with a history of them — the instructions are in the box at the top of this page
- A burn or a blister from a device: uncommon, and associated with a setting that did not suit the skin or with skin that was not prepared for the session — the box at the top of this page says what to do about it
- Uneven fading: part of it goes and part lags, and an old mark may not clear completely. No date is put on this
- Months lost when a mark is treated as something it is not: red treated as brown, or lightening applied over a fungal or allergic cause that is still running underneath it
A note on darker skin
This page is written for Fitzpatrick III to VI in the first place, and post-inflammatory pigmentation is the commonest color complaint in that range: what passes on lighter skin as redness that clears passes here as color that stays for months. What suits deeper skin: treating the cause first; daily sun protection counted as part of the treatment rather than decoration laid over it; pigment-directed topicals started low and built slowly; gentle superficial peels repeated rather than one deep peel; conservative needling once the skin is calm; and a test spot before any laser or peel, with conservative settings and density and wider spacing between sessions. What needs caution: medium-depth peels, ablative laser resurfacing, repeated passes in one sitting, and any device run over pigmentation that is still active — their settings are all calibrated on lighter skin and do not transfer as they stand, and the line in the advertising that a device suits every skin tone is not a reason to raise the energy. One practical thing belongs to these skin types in particular: visible light and heat move pigment too, so a clear sunscreen screening ultraviolet alone is often not enough, a tinted sunscreen with iron oxides does more here, and car windows and the heat of a kitchen both count. Pale marks, where they happen, show more plainly on this skin and are slower to change, which is why settings are kept conservative from the start. Skin type is judged by examination for each person, and never inferred from nationality.
Afterwards
- Sun protection daily on the area, and not for outdoors alone: a car window lets through what moves the color, visible light and heat move it too, and a tinted sunscreen does more here than a clear one. Reapply over whatever is uncovered during the day
- Stop the friction: no loofah, no scrubbing, no coarse exfoliants on knees, elbows and underarms, looser clothing, no picking at spots and no worrying at the marks. Every round of rubbing renews the color you are waiting to see fade
- Use only what you were given, and introduce it gradually. If the skin stings or reddens, reduce how often you use it and tell us rather than pushing through: the irritation itself becomes color
- Come to appointments with everything you put on the area, in its own container, including the mixture if there is one
- Photograph the area in the same light and from the same angle at whatever interval we agree. Fading is slow, and a photograph is what shows a difference the mirror does not show you day to day
- Report: a new spot or inflammation in the area, itching, scaling or an edge that is spreading, a pale patch that has appeared, or fresh darkening after a session
- And report promptly a mark that thickens, grows, changes shape, bleeds or will not heal, particularly over an old cautery or burn scar. These are not handled as post-inflammatory marks and need examining in their own right
- Tell us before any session about what has changed: a new medicine, pregnancy or breastfeeding, threading, waxing or sugaring of the area, recent sun or travel such as Hajj and Umrah, a cold sore, or a change in your diabetes control
- Come to the review appointment even if you think nothing has changed. Whether to add a procedure or to wait is decided at that appointment rather than outside it
Honestly
Nothing fades while the inflammation underneath is still running, picking or scrubbing at the marks restarts the cycle, fading is measured in months rather than weeks, and continuing laser or aggressive lightening through active pigmentation usually deepens it.
Common questions
How long until the marks go?
Honestly: months rather than weeks, and it varies with how deep the color is, where it is, and whether its cause has actually stopped. We do not give a date, and anyone who gives you one is guessing. What helps most at the start is two things before anything else: stopping whatever is inflaming the skin, and daily sun protection.
My underarms are dark and I want them lightened — can we start today?
We start with an examination, and the examination often changes the plan. If the area itches, scales or has a spreading edge, a scraping is taken and looked at under a microscope first, because steroid-modified fungal infection is common in anyone who has used a mixed cream, and lightening on top of it spreads it. If the skin is velvety and thickened, the question widens to the whole body and a blood sugar check is done. If the cause is friction or the hair-removal method, changing that method does more than any cream. And if the color is simply your own skin in that area, we will tell you plainly — that is not a disease to be treated.
I use a lightening mixture from a shop. Should I stop it?
Stop it, but not abruptly and not on your own, and bring the container with you. Many of these mixtures contain a steroid, and stopping one all at once flares the skin, so you conclude the new treatment caused it. It is withdrawn gradually and on a plan, and the skin is brought back to baseline before any peel or device.
My marks are red, not brown. Same treatment?
No, and this is a distinction that costs people months. A red or pink mark is dilated vessels rather than pigment, and lightening creams and pigment lasers do nothing for it. It settles as its cause is controlled, with time and sun protection, and vascular device options are a separate conversation decided by examination. The two kinds often sit on the same face, so they are distinguished and treated separately.
Cupping left dark rings on my back. Can they be lasered off?
Those rings are post-inflammatory pigmentation. They fade slowly with time and sun protection, and treating them early and aggressively is what makes them persist. Repeating cupping over the same spots while they are still dark renews the color each time it starts to fade, so if you are continuing with it, the practical advice is to rotate the sites, to use single-use equipment with a licensed practitioner, and to keep the sites protected from the sun. There is no awkwardness in telling us about it — we ask, because the pattern is recognizable once you know it is there. Marks from traditional cautery are different and are handled as scars rather than as color.
The black henna at a wedding left the shape of the design on my hand.
What did that is not the henna itself but the PPD added to the black product; red-brown henna rarely does it. What is left is post-inflammatory pigmentation that takes months and strict sun protection, and in skin prone to it the reaction can leave a raised mark handled as a scar. What matters more than the mark on your hand is what follows it: this allergy stays with you, so avoid hair dyes containing PPD, tell whoever colors your hair or brows, and be careful with dark dyes generally. And if the hand is still blistering or swelling, read the box at the top of this page.