Tattoos: It seems that they can cause health problems.
Denmark did a study with twins: one with tattoos and the other without. They found that skin cancer and lymphoma were more frequent in those with the tattoos.
The inks contain heavy metals and chemicals like propylene glycol, traveling from skin to blood to lymph nodes. They move into your lymph system because the human body is trying to remove what it (correctly) perceives as foreign matter.
Here’s the study: https://pubmed.ncbi.nlm.nih.gov/39819495/
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