My skin has turned black these days, I haven't been in the sun, and the weather is still cold. I wear long sleeves.

The method of losing weight should be reasonable, and it should not be rushed. What's more, it is unscientific to eat only tomatoes for a few days. If other nutrients are not enough, your color will get worse. Arrange your diet scientifically and reasonably, don't overeat, stretch your legs and exercise more when you have time, and your weight will naturally drop. Let the weight drop gradually, and don't lose weight suddenly, otherwise the skin will be very slack.