Can I get rid of the black spots on my forehead and cheeks, and can I get back my original skin tone?

Doc gav me q-clin gel to apply on dark spot on forehead n cheek. After 15 days Face tone turn black n itching. Doc told its side effect allergy. Gav me fudic cream to treat it. Now Itching gone. Want to knw will i get my fair skin tone back and how much time it will take

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