I used a kojic acid + glycol serum on dark areas of my skin. It made it darker. Will it naturally fade away?

Kojic acid + glycol made the area I am treating darker. It caused me rashes and made the side of my face to swell up in just less than a week. I immediately stopped using it. But then the rashes left scars and the area got darker than before. I am afraid to use any product. So I want to know if it will fade away naturally.

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