MAKEUP PRODUCTS (NON-PERMANENT)

Though many chemicals in beauty products and cosmetics present hardly any or no threat, several dozen are linked with substantial medical problems, such as developmental delays and cancer. Chemicals in cosmetics invade a person's body through the skin and inhalation, and pose the same dangers as food chemicals, per this site.

Contaminants and chemicals linked to cancer can be found in food and various other commonly used products. Still, no category of consumer products is subject to less government direction than cosmetics, including Hot Rocks. While most of the chemicals and contaminants in cosmetics almost certainly present minimal risk, subjection to some is linked to significant health disorders, such as cancer.