My stomach is blacker than all of my other body parts. What should I do so that it gets fair?

areas of the body can have reasons to be pigmented more than others, sun protection, peels, lighting creams (see link) all can be used. often this is permanent but can be "improved" with treatments.  please consult with a dermatologist that specializes in pigmentation.Hyperpigmentation from any type needs a combination approach of peels like cosmelan,  lasers like clear and brilliant and aerolase or laser genesis, radiofrequency like venus viva, and constant skin care and sun protection.  Bimontly facials with silk peel dermalinfusion is essential to hydrate, exfoliate and infuse vitamins and antioxidants into the skin.  If you have acne you can do additional treatments and peels to get more improvement.  I suggest a formal consultation with an expert in lasers and peels. Best, Dr. Emer.