Getting tattooed may lead to long-term skin problems and an increased risk of cancer, according to a new report by a European regulatory authority.

The European Chemicals Agency is calling for a ban on tattoo ink, citing a new agency study that identified risks for cancer, serious allergic reactions, and painful itching that can last for years, The Sun reports.

Researchers found red ink was the most dangerous, but warned that blue, green, and black inks are also risky.

“The most severe concerns are allergies caused by the substances in the inks and possible carcinogenic, mutagenic, or reproductive toxic effects,” the ECHA said in the report.

The U.S. Food and Drug Administration regulates chemicals in products including tattoo ink, cosmetics, and color additives. But the FDA has not traditionally regulated tattoo ink and pigments.