I believe, this subject has been reported and discussed for at least the past 50 years. Here is some of the latest research based on a twin study. It seems large size tattoos are more dangerous.
Since it has become a big business and so many people now carry tattoos in the 21st century, the medical profession is still unable to give better answers! This is a huge skandal!
According to Google AI enhanced search: "There are roughly 20,000-26,000 tattoo parlors (or body art studios) in the United States, with the market size estimated at around $1.5 billion." & "Approximately 32% of American adults report having at least one tattoo, with 22% having more than one."
My best guess is that tattoos do not seem to be very risky when it comes to cancer. E.g. would we have not already noticed an increase of cancer cases among individuals working in tattoo parlors that can be traced to their work? Tattoos have been around for about 5,000 years.
Maybe more research into this issue seems to be necessary and recommendable.
Disclaimer: I do not intend to claim or insinuate that tattoos cause cancer or increase cancer risk or to diminish or downplay any potential or real risk.
"Assessing the cancer risk of modern tattoo ink has proven a challenge [???] — it can contain many different chemicals and production isn’t standardized worldwide. Recent studies have hinted that tattoos might be linked to lymphoma and skin cancers, with the risk increasing with tattoo size. That could be down to that tattoo stimulating a chronic immune response, says Signe Clemmensen, a public-health researcher and the co-author of one of the studies. But we’ll need much larger studies to get clearer answers."
From the abstract:
"Background
We aim to study the potential association between tattoo ink exposure and development of certain types of cancers in the recently established Danish Twin Tattoo Cohort. Tattoo ink is known to transfer from skin to blood and accumulate in regional lymph nodes. We are concerned that tattoo ink induces inflammation at the deposit site, leading to chronic inflammation and increasing risk of abnormal cell proliferation, especially skin cancer and lymphoma.
Methods
We conducted two designs of twin studies to improve confounder control: A cohort study of 2,367 randomly selected twins and a case-control study of 316 twins born in the period 1960–1996. Cancer diagnoses (ICD-10) were retrieved from the Danish Cancer Registry and tattoo ink exposure from the Danish Twin Tattoo survey from 2021. The analysis addressed effects of time-varying exposure.
Results
In the case-control study, individual-level analysis resulted in a hazard of skin cancer (of any type except basal cell carcinoma) that was 1.62 times higher among tattooed individuals (95% CI: 1.08–2.41). Twin-matched analysis of 14 twin pairs discordant for tattoo ink exposure and skin cancer showed HR = 1.33 (95% CI: 0.46–3.84).
For skin cancer and lymphoma, increased hazards were found for tattoos larger than the palm of a hand: HR = 2.37 (95% CI: 1.11–5.06) and HR = 2.73 (95% CI: 1.33–5.60), respectively. In the cohort study design, individual-level analysis resulted in a hazard ratio of 3.91 (95% CI: 1.42–10.8) for skin cancer and 2.83 (95% CI: 1.30–6.16) for basal cell carcinoma.
Conclusion
In conclusion, our study suggests an increased hazard of lymphoma and skin cancers among tattooed individuals, demonstrated through two designs: a twin cohort and a case-cotwin study. We are concerned that tattoo ink interacting with surrounding cells may have severe consequences. Studies that pinpoint the etiological pathway of tattoo ink induced carcinogenesis are recommended to benefit public health."
Tattoos are being linked to some cancers. Are they really a risk? "Having a tattoo has been linked to a higher risk of conditions like lymphoma and skin cancer, but the situation isn't clear-cut"
Tattoo ink exposure is associated with lymphoma and skin cancers – a Danish study of twins (open access)
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