The white powder left after the sweat dries is sodium chloride and some chemicals.
Sweat is the liquid secreted by the sweat glands, the human body mainly through sweating to disseminate heat, more than 99% of the sweat is water, but also contains a number of chemicals, the main one of which is sodium chloride, in addition to some potassium, magnesium, calcium, lactic acid, etc., after the evaporation of the sweat water, these chemicals will remain on the surface of the body, manifested as a white powder.
Sweat dry after leaving white powder is a normal phenomenon, should be timely cleaning of the skin, otherwise bacteria will grow on the skin surface, easy to block pores, folliculitis and other skin diseases, is not conducive to the health of the body. In addition, if you sweat more, you should actively replenish water and salt, to avoid the body’s osmotic pressure decreased.
Sweat dries leaving a white powder, if there are no abnormal symptoms do not need special treatment, if there are uncomfortable symptoms, you should consult a doctor in time.