Washing your face alternately with hot water and cold water (hot water first, then cold water) can not only achieve the purpose of cleaning the skin, but also make the superficial blood vessels of the skin expand and contract, enhance the breathing of the skin, promote the blood circulation of the face, and achieve the beauty effect. It can also shrink pores and achieve the effect of firming skin.
Washing your face alternately with hot water and cold water can also increase resistance, stimulate immunity, relieve skin burning and itching, reduce irritation and reduce skin allergic reactions.