Why is the skin particularly good in autumn and particularly bad in winter and spring?

In winter, the temperature is low, the blood circulation of the body is not so good, the skin is easy to dry and dehydrate, and the self-healing ability becomes weak. In spring, everything recovers and bacteria multiply, so the skin is prone to allergies and infections! In autumn and summer, it turns cold, and the skin pores change from open state to contracted state. At this time, the skin condition becomes particularly delicate, and the temperature, humidity and temperature are suitable, so the skin is delicate, soft and smooth.