기미 (gimi): melasma on deeper skin, and why the cosmetic answer is limited
Melasma is a pattern of symmetrical brown or grey-brown patches, usually across the cheeks, forehead or upper lip, and it behaves differently from a post-spot mark: it recurs, it responds to heat and visible light as well as ultraviolet, and it is genuinely hard to shift. It is a medical diagnosis rather than a self-diagnosis, and management belongs with a dermatologist. Cosmetics can support the look of an even tone; they will not resolve it.
Melasma is not just a large dark mark
Post-inflammatory pigment follows something that happened — a spot, a burn, a scratch — and sits where that thing was. Melasma appears without an injury, tends towards symmetry across both cheeks or above the lip, has soft irregular borders, and often flares with pregnancy, hormonal contraception, heat and sun. Those differences matter, because the management is different and because several other conditions look similar to an untrained eye. A dermatologist distinguishes them; a comment section does not. If patches have appeared without an obvious cause, have them looked at rather than treated blind.
Why deeper skin makes it harder
Pigment sitting deeper in the skin is less accessible to anything applied on top, and in richer melanin a larger share of melasma pigment tends to sit that way. The clinical shortcuts used to judge that depth work less well too. Recurrence is the rule rather than the exception at every skin tone, and on skin that also pigments readily after inflammation, the interventions capable of real progress — peels, lasers, certain prescription combinations — carry a genuine risk of leaving new marks behind. Experienced clinical hands matter more here than clever product choices.
What actually helps, honestly ranked
Daily broad-spectrum sun protection is not a supporting measure; it is the intervention with the strongest case, and for melasma the argument for a tinted formula containing iron oxides is stronger than almost anywhere else, because visible light is part of the picture. Heat matters too, so saunas, steam and long hot commutes are worth noticing. Beyond that, cosmetic actives such as niacinamide, azelaic acid and topical tranexamic acid can support the appearance of a more even tone with slow, patient use. Their evidence quality varies, and none of them matches what a clinic can prescribe.
The over-claimed corner
Melasma attracts more marketing nonsense than any other pigmentation topic, because it is stubborn, highly visible and emotionally loaded. Be sceptical of anything promising to clear it in weeks, of very high-strength brightening kits sold without oversight, and of imported creams of uncertain composition — unlabelled skin-lightening products have caused real harm and remain a live problem in several markets. If something appears to be working faster than a prescription would, treat that as a warning rather than a selling point, and take the product to a clinician.
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✍️ 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.