Pimples on my bum and my bum's dark.

I hav got a very clear skin n wheatish complexion bt my bum is dark compare to my body or face colour and has got pimples all over from last 6/7 yrs. Pimples on my bum n its dark...BT my whole body s very fair n my inner thighs are also dark. What should I apply to get rid off it.

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