personal choice . . . . . . .
From the purely medical point of view it's simply not an issue (always assuming that you didn't catch something nasty by getting a tattoo done in an unhygienic place !)
Potential employers might be unhappy with tattoos that were visible while wearing normal working clothes (uniform). They could never know about any which were not thus visible. In my job I see plenty of tattoos that friends and colleagues are probably not aware of ! I also know that many of them are now bitterly regretted !
Personally, I still can't see why they are done at all . . . . . . . . . but it's personal choice, as always.