black spots can be because of various reasons. so treatment of the spots depends on why you have the spots in the first place. Is the pigmentation superficial or is it deep? It is confusing I know so therefore it is better that you personally visit a dermatologist in your area. The doctor will thoroughly examine you and guide you on whats to be done. There are creams and treatments like peels that might help you.
Till then read this http://www.skinmatra.com/#!WANT-FAIR-SKIN-THINK-TWICE/cmbz/57a827a90cf2cb1cfffb5de9 and read this too : http://www.skinmatra.com/#!Skin-Troubles-Here-is-WHAT-NOT-TO-DO/cmbz/5779118d0cf2d54ad62a8b1e.
Visit a dermatologist near you
Do not use creams or 'treatments' suggested by friends or family or pharmacists