Overview
- The population-based case-control study in the European Journal of Epidemiology found a 29% higher melanoma risk in tattooed people after adjusting for UV exposure, skin type, tanning beds, and sunburn history.
- Risk varied by exposure: mixed black and colored ink was linked to a 38% increase, 10–15 years since first tattoo to 67%, and under five years to 60% with wider uncertainty.
- Most tumors were located away from tattoos, which researchers say may implicate immune or body-wide effects of ink components.
- Tattoo inks contain polyaromatic hydrocarbons, aromatic amines from azo pigments, and heavy metals, some classified as carcinogenic by IARC.
- EU limits on thousands of tattoo-ink chemicals took effect in 2022, yet market checks report continued noncompliance and deceptive labeling, while authors stress the observational data do not prove causation and call for further studies.