Dark pigmentation

I have some dark pigmented spots on myb forehead , they were previously acne , the pimples come and go but they remain as they are, should I be worried? What should I do? Along with this I have pimples on my back and upper portion of arms as well. Pls help me...
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Dr. Devesh Singh
Dermatologist 10 yrs exp Lucknow
Apply sunscreen and in night hydroquinone 2% on affected area.
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