On the issue of washing your face with cold water or hot water, it is not good to be too cold or too hot.
Cold water can cause pores to shrink and the dirt is not cleaned, but if the hot water is washed clean, the oil that protects the skin will be washed away.
If people with sensitive skin or microvascular abnormalities may even worsen their symptoms, experts recommend using a cool water that is lower than the body temperature, about 20 degrees Celsius or so.
Of course, it is not always possible to wash the face with water temperature. In principle, as long as the skin does not feel that the water is not too cold or too hot.