Some chemicals in cosmetics directly irritate the skin and cause itching after contact with the skin.
Some cosmetics contain heavy metals, such as lead, chromium and picks. After long-term use, it will be absorbed by the skin and accumulated in the body, causing toxic reactions.
Some cosmetics contain hormones or antibiotics, and long-term use of these cosmetics will produce allergic reactions or side effects.
Impermeable cosmetics lead to the blockage of sweat glands and sebaceous glands in hair follicles, causing folliculitis and acne.
Some cosmetics will age skin cells, reduce skin elasticity, relax, dry and even shrink under the action of light.