As many have said, it probably isn't legal to tattoo someone under the age of 18. Even if (and that's a big if) it is, they usually require parental permission. And even if (an even bigger if) that's not required, I wouldn't trust anyone with the poor judgment to tattoo someone under the age of 18. Given the permanency of tattoos, you don't want anyone who doesn't have a measure of integrity. As much as a good tattoo isn't cheap, a good tattoo artist takes pride in their art form. Tattooing minors harkens back to tattoos for the rule breakers and ne'er do wells rather than the mainstream method of personal expression it is today. And even then concealers are valuable only in certain situations, IE employment. A tattoo you have to cover up even in your personal life is a tattoo you are ashamed of. If you know you'll be ashamed of a tattoo you'll get even before there's needle to skin, then that's a clear signal telling you not to get it. Punchline; the fact that you're already looking to cover up something you're too young to get in the first place means you should let your idea stew until you are eighteen. Perhaps you can talk to an artist to get it done at midnight on your 18th birthday.