Mine is on my wrist, and it's the same place they look for a bracelet.
It is a Cadeceus, the same symbol on a medic aler bracelet, known all over the world. I have 'insulin dependant' and 'diabetic' written either side of it.
If they don't take any notice of it, they're idiots, as it's exactly the same info and design as on the bracelets, and pretty much all paramedics know that some people have the info tattoo'd on them.
If it looks medical, they'll take notice, if it looks decorative, they'll take it as decorative.