색소침착 (saeksochimchak) after a spot: why post-inflammatory marks last longer in richer melanin
Marks left after a spot or a scratch last longer in skin with more melanin because the same inflammation triggers a larger pigment response and some of that pigment settles deeper, where it clears far more slowly. Months is normal and longer is common. Cosmetic products can influence how visible a mark looks, but nothing on a shelf clears one quickly, and anything persistent or unexplained belongs with a doctor.
What the mark is
Inflammation — a spot, a shaving nick, a scratched insect bite, an over-enthusiastic exfoliation — signals pigment-producing cells to work harder. In skin with more active melanin production that response is larger, and some of the resulting pigment settles below the surface layer rather than only within it. What remains is the flat brown or slate-grey patch that sits there long after the original spot has gone. It is not a scar: the surface of the skin is intact. It is a colour problem, and colour problems in deeper skin are simply more visible, for longer.
Why the timeline is so long
Pigment near the surface leaves as skin cells turn over, which takes weeks. Pigment sitting lower has to be cleared by a much slower process, measured in months. That is why the standard internet promise of clear skin in a fortnight is either describing superficial redness or is nonsense. Expect slow. The most effective accelerator in the wrong direction is ultraviolet exposure, which restimulates the same cells and quietly undoes progress — which is why every credible piece of advice about dark marks starts with sunscreen rather than with a serum.
What cosmetics can honestly claim
Cosmetic actives influence the appearance of pigment. Niacinamide is the best-supported of the widely available options and unusually well tolerated. Azelaic acid has decent backing. Topical tranexamic acid looks promising, though the evidence is thinner than the marketing around it suggests. Alpha-arbutin, liquorice and vitamin C sit in the modest-and-variable band. None of them removes pigment. They help even the look of tone across months of consistent use, alongside daily sun protection. A product promising to erase marks is describing something cosmetics are not permitted to do.
When this stops being a skincare question
A dermatologist has options a shelf does not, including prescription agents and procedures — and procedures on skin that pigments easily carry their own risk of leaving new marks, which is exactly why they need someone who works with your skin type routinely. See a clinician if marks are spreading without an obvious cause, if they form a symmetrical pattern across the cheeks, if a patch is changing in shape, colour or texture, or if months of consistent effort have produced nothing. Guessing for a year is the expensive option.
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🙋 People also ask
Does Korean skincare work for deeper skin tones?
The skincare does — hydration, barrier support and soothing actives are not tone-specific. The friction points are mineral sunscreens that leave a cast and a colour-cosmetics shade range that has historically been narrow.
How long does Korean skincare last?
Unopened and stored sensibly, most Korean cosmetics are given around three years from the manufacturing date. Once opened, follow the PAO symbol — the little open jar marked 6M or 12M — which is what actually applies.
✍️ Written & reviewed by the KoreaPlus Editorial team — dermatologist-informed, cosmetic-science researched & source-cited. Last reviewed: 2026-08-23.
General educational information using cosmetic structure-function wording — not medical advice. Always patch-test new actives. © KoreaPlus.