How is skin white in summer and black in winter?

Because your skin is tender and the cuticle is thin, it is suitable for high temperature weather. In hot summer, the skin swells, melanin fades, and in winter, the skin shrinks and melanin accumulates. In addition, the enlargement of pores in summer is conducive to the discharge of toxins in the body, and the moisture in the air is large, which is conducive to the metabolism of new dust in the skin. In winter, cold air is dry and keratin accumulates. Therefore, it is recommended that you use a hydrating mask.