A twin study conducted by University of Southern Denmark researchers found that tattooed individuals were nearly four times more likely to develop skin cancer than their ink-free counterparts.
Among 316 twin pairs, the sibling with tattoos had a 33–62% higher likelihood of being diagnosed with cancer, with larger tattoos (bigger than a palm) tripling the risk.
While the findings do not prove tattoos cause cancer, they raise concerns about long-term health effects.
Biostatistician Signe Bedsted Clemmensen notes that ink particles accumulate in lymph nodes, potentially triggering an ongoing immune response.
“We do not yet know whether this persistent strain could weaken the function of the lymph nodes or have other health consequences,” adds Odense University hematologist Henrik Frederiksen.
The type of ink used may also be a factor. Some tattoo pigments contain substances not approved for use in cosmetics, and red ink is known to cause allergic reactions.
A 2016 European Commission report found that many tattoo inks degrade into carcinogenic compounds, making further research essential. As Clemmensen states, “The extent of the impact on the immune system should be further investigated.”
Centrist Ltd.