Melanin · Not Scarring · CityLink Mall
The brown mark left behind after a spot heals is not a scar and not damaged tissue. It is melanin, deposited by a melanocyte that was provoked by inflammation and has not yet stopped — which is why it fades on its own, slowly, and why the fastest way to clear it is to stop provoking it.
Post-inflammatory hyperpigmentation is a normal response of melanin-rich skin, performing correctly, at the wrong moment. When the skin is inflamed — by acne, eczema, a burn, an insect bite, friction or an over-aggressive treatment — the inflammatory cascade releases mediators including prostaglandins, leukotrienes and various cytokines. Several of these act directly on the melanocyte, increasing tyrosinase activity and driving melanin production upward. The pigment is then handed off to surrounding keratinocytes in the usual way. What is left when the inflammation resolves is a patch of skin carrying an excess of perfectly ordinary melanin.
This matters because it sets the ceiling on how fast the mark can clear. Epidermal pigment leaves with epidermal turnover, and the epidermis renews itself over a matter of weeks — but the melanin has been distributed through several layers, and each successive cycle carries only a portion of it away. A single mark therefore fades over months rather than weeks, and it fades progressively rather than suddenly. A treatment that claims to clear it in one session is describing something else.
Where the inflammation was severe enough to disrupt the basement membrane between epidermis and dermis, pigment falls through into the dermis and is taken up by macrophages. This is dermal PIH, and it behaves entirely differently. It looks greyer and less sharply bordered, sits beyond the reach of epidermal turnover, and clears over a year or more if it clears fully at all. The depth of the original inflammation, not its duration, is what determines which of the two you end up with.
Skin type is the other determinant. In Fitzpatrick III to V skin the melanocyte is more readily provoked and responds more vigorously, which is why PIH is the dominant sequel of acne in this population while erythema is the dominant sequel in paler skin. It is also why every procedure performed on this skin has to be dosed with PIH in mind. A great deal of the pigmentation seen at Atelier Aesthetics was not caused by the original condition at all — it was caused by the treatment given for it.
Classification
PIH is sorted by where the melanin ended up, because depth governs both the colour you see and the time the mark will take to go. Stretching the skin gently and viewing it in good daylight helps: epidermal pigment stays brown and defined, dermal pigment reads grey and diffuse. The third category below is the one most often mistaken for PIH, and it does not respond to pigment treatment at all.
Post-inflammatory hyperpigmentation is not a scar. It is pigment sitting in living skin, and the first thing it needs is for the inflammation to stop.
Sequencing
Treating the pigment while the inflammation continues is the commonest error, and it is a waste of both time and skin. If the source is active acne, the acne is managed first — pigment work started before acne treatment has taken hold simply produces a new crop of marks beside the ones being treated. The same applies to eczema, to friction in the underarm, and to any irritant regimen the patient is still using at home. Nothing is gained by lightening a mark that is about to be replaced.
Once inflammation is settled, three measures do most of the work. Photoprotection comes first — broad-spectrum, reapplied, and tinted where possible, because high-energy visible light independently drives melanogenesis in Asian skin. Topical therapy comes second, interrupting tyrosinase activity and pigment transfer, used in planned cycles rather than indefinitely. Devices come third: low-energy laser toning or a conservatively dosed picosecond laser, spaced generously and stopped rather than escalated if the skin responds by darkening.
The restraint is not caution for its own sake. PIH is caused by inflammation, and a laser delivers inflammation — so an aggressive setting on Fitzpatrick IV skin can reliably produce the very condition it was meant to clear. That is the reason treatment in this practice is built around low fluence, long intervals and early review, and the reason a mark that is already fading on its own is often best left to finish doing so. The question at consultation is usually not which device, but whether a device is required at all.
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