Will this pigmentation ever go away? With anything? (photo)

I went to a dermatologist on Nov.17.She gave me a pigment gel called PCA Skin Pigment Gel. She told me to only apply it once at night for a dark spot I have. The day after my dark spot was 5X worse & I stopped using the gel. A week later & this is my result.The dark spot is really dark to me & I'm afraid it will never go away

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