I have a tattoo on my forearm, and it has not been a problem for me professionally. When I have worked at jobs that required me to cover it, I just wore 3/4 length sleeves. I have also shadowed PT's with visible tattoos as well, didn't seem to be a problem for them either. I do live in a less conservative area though, so if you live somewhere pretty conservative maybe reconsider. And make sure you cover it for any interviews 🙂