Most Helpful Guy
I love tattoos, so I almost always say 'go for it'. But the opinions you need are not those of random people on the internet for a case like this. What you need to do is go to a couple of hospitals and ask there, to make sure it isn't an issue. Some places may 'say' that they don't have a problem with things because of how their hiring regulations have to work, but they will have 'soft' rules that get enforced anyways.
If you were thinking of getting it somewhere easily covered I would say 'who cares', but this can have an effect on your ability to get employment, so take an afternoon and check it out. It would suck to be wrong.