Why is the face black when it is hot, and will you get acne? It's a little cold. Why?

The weather is hot, dark, acne-ridden, cold and white, which is related to human metabolism. In summer, the weather is hot and the metabolism is fast. Besides going to the toilet, the main way of excretion is sweating. If the skin can't excrete the body waste in time, it will leave the waste on the skin surface and form acne, which is a bad metabolism. Dark skin is hot in summer, and the sun's ultraviolet rays are very strong. Try to avoid direct sunlight, and it is cold in winter, just the opposite of summer. The way the human body metabolizes through sweating is very small, and it generally does not sweat without a lot of exercise. As long as it is not oily skin, the body generally does not grow acne, and the skin is white because it is worn too much, so the sun is generally not so thick! Personal opinion!