Inflammation left pigment behind. GHK-Cu works on the repair, not the pigment.
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Every breakout is an injury. Skin responds by making pigment — and in deeper tones it makes more of it.
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The mark is unfinished healing. Not a stain sitting on the surface. That's why brightening serums miss it.
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GHK-Cu is your own repair signal. The same molecule your body uses after injury, given back topically.
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Works from underneath. It doesn't bleach anything. It helps skin finish what it started.