New study links tattoos to a 29% higher risk of melanoma.People with tattoos may face a significantly elevated risk of cutaneous melanoma, according to a new population-based study from Lund University in Sweden.After adjusting for potential confounding factors such as sun exposure and skin type, researchers found that individuals with tattoos had a 29% higher relative risk of developing melanoma compared to those without tattoos (adjusted incidence rate ratio: 1.29). The increased risk was observed for both invasive and in situ melanomas.Interestingly, the size of the tattoo did not appear to influence the risk level. However, the timing may matter: the association seemed strongest in the years following tattoo placement, with some evidence suggesting elevated risk particularly within the first 10–15 years after getting inked. The study also noted higher risks among individuals with both black and colored tattoo pigments.The researchers emphasize that the findings show a statistical association at the group level, not proof of direct causation. They hypothesize that tattoo ink pigments — treated by the body as foreign substances — may trigger chronic inflammation or lead to the migration of potentially harmful particles to the lymph nodes. Azo pigments, commonly used in tattoo inks, are of particular interest because they can break down into compounds with known carcinogenic potential.As tattoos continue to grow in popularity, these results highlight the need for further research into the long-term health effects of tattoo ink and its interaction with human biology.[Rietz Liljedahl, E., Nielsen, K., Engfeldt, M., & Nielsen, C. (2025). Does tattoo exposure increase the risk of cutaneous melanoma? A population-based case-control study. European Journal of Epidemiology. DOI: 10.1007/s10654-025-01234-5]Science and facts💡

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