Analysis:

Sweat components can be divided into inorganic components and organic components, both of which are metabolites in the body. Inorganic components are mainly salts such as sodium chloride and calcium carbonate, some of which are acidic and some are alkaline. Excessive accumulation of these acid and alkali components will directly corrode the skin, destroy the tissues and cells of the skin, and lead to skin aging. The accumulation of organic components in sweat on the body surface is more conducive to the reproduction of microorganisms on the body surface under the impetus of high temperature weather.

Due to air pollution and the use of equipment in gymnasiums, a large number of bacteria and parasites on the skin surface will decompose the organic components in sweat, produce various toxic substances and release malodorous gases, thus producing a serious "sweat odor" and even causing skin diseases, which are also commonly known as sweat rash, folliculitis, eczema, boils and miliaria.

In addition, sweating will reduce the resistance of the skin. Sweat and sebum are secreted normally, and form a sebum film after mixing on the skin. Excessive sweating, the proportion of sweat and sebum is unbalanced, and sebum will be washed away by sweat and become thinner. Generally speaking, normal weak acidic skin will become alkaline, so the resistance of bacteria will be weakened and the bactericidal power will also decrease. Some people will have skin diseases, and some people's skin will become rough.