After pregnancy, the endocrine changes in pregnant women, hormone levels increase, resulting in localized skin mucosa melanin deposition, appearing neck blackening, can be solved through the use of skin care products, pay attention to sunscreen and other methods. 1. Use of skin care products: If you want to make the skin a little fairer, you can do some basic skin care every day, to use skin care products specifically for pregnant women, usually pay attention to skin cleaning. 2. Pay attention to sunscreen: When you go out, you should do a good job of sunscreen measures, playing umbrellas, wearing sun hats and so on can be in order to reduce the stimulation of ultraviolet rays on the skin, slowing down the precipitation of melanin. It is recommended to supplement vitamins and trace elements appropriately during pregnancy, go out and do a good job of protection, avoid the wind and sun, etc., if you feel unwell, go to the hospital for examination in a timely manner.