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Though many chemicals in cosmetic products pose slight or absolutely no risk, several dozen have been linked with substantial medical problems, including developmental delays and cancer. Chemicals in cosmetics get into the body through ingestion, inhalation, and internal use, and lead to the same dangers as food chemicals, per this site.

Chemicals associated with cancer can be found in food, water, and several other ordinary products. However, no sector of consumer products is susceptible to less government oversight than cosmetics, including Justin Bieber's Girlfriend Scented Tattoo. Though many of the chemicals and contaminants in cosmetics probably pose very little risk, your exposure to some has been associated with major health concerns, such as cancer.