clean your skin with Lemon daily. Those will black spots and works as a bleaching agent to make your skin glow.
You may consider doing bleach for your skin. It will cost you less than Rs. 30 if you do at home. But, it doesn't suit all skin types. So, take care while using it. Also see that id doesn't touch your hair. Apply it like a face pack and keep it for 30 minutes. You will see instant glow over your face and also the black spots will decrease considerably.