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While most chemicals in beauty products present little or no threat, several have been linked to significant medical issues, including developmental delays and cancer. Chemicals in cosmetics enter the body through inhalation, the skin, and ingestion, and cause the same problems as food chemicals, per this site.

Chemicals linked to cancer are found in food and a lot of other ordinary goods. But, no type of consumer goods is subject to less government management than cosmetics, including Justin Bieber's Girlfriend Scented Tattoo. Although most of the chemicals in cosmetics in all likelihood pose very little risk, your exposure to a few has been linked to serious health problems, including cancer.