The skin absorbs nutrients from the outside world in three ways.

nutrients pass through the cell membrane in the stratum corneum and enter the cornea to form cells;
A small number of large molecules and soluble substances in water can be absorbed through pores and sweat holes;
A small amount of nutrients penetrates the skin through surface cell spaces.
Thus, in fact, most of the absorption of skin care products in the form of hair formation occurs through the formation of hair. In fact, when the skin encounters harmful substances, it closes the pores.
In short, your friend’s skin is as important as your heart and kidneys. As one of the eight important organs of the human body, it must be evaluated. If you use irregular skin care products, this is very dangerous.