My tattoo artist tatto on 3 beauty spots that never changed for years is it possible that they still become cancerigene? I'm nervous about this

See my other answer. You posted the same question twice - please check my other answer.
Absolutely. Coloring a mole with tattoo ink makes it nearly impossible to monitor for worrisome changes. They can still become precancerous or turn into melanoma (cancer). The only way to evaluate them is to biopsy or remove them for pathological evaluation.