I do not know, just be sure it is something you want there for the rest of your life.
I have a horse shoe behind my right hear....no bigger then a quarter.
I do not regret it, heck people who have known me for years do not even recognize it.
You can not see it when my hair is down, and because its somewhere you do not really look people half the time don't even notice it when my hair is up.
Defiantly get it somewhere it can be easily hidden.