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How Should Cosmelan 1 Mask Be Used?

How should I use the Cosmelan 1 mask? Would you recommend to treat the melasma first for about 4 1/2 hours and to treat the rest of my face for 3 1/2 hours (skin type III)? Or sould I treat the entire face for 8 hours? What is about the anti-aging effect of Cosmelan? Thanks.

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