People's skin color is generally determined by the quantity and color of melanin produced by melanocytes, which is related to personal physique. Some patients have congenital white skin, and some patients have congenital black skin, all of which are related to melanin. In addition, the skin will turn black after a long time under the influence of ultraviolet rays.
For congenital black skin, you can generally consider eating more foods containing vitamin C, such as tomatoes, strawberries and kiwis. Foods containing vitamin c have whitening effect. At the same time, avoid staying up late. Staying up late for a long time will slow down the body's metabolism, leading to dull body pigments and dark skin.
If the skin turns black because of the long-term influence of ultraviolet rays, you can do a good job of sun protection and repair after sun exposure, and you can eat more vitamin A and vitamin E, which can play a certain role in skin care.
Drinking milk alone will not turn white, so we should pay attention to sun protection and improve our diet. I hope my answer is helpful to you!