To the guy above wtf?…a saggy birthmark?…tattoo’s arent birthmarks…..anyways…i dont think you should do it on the lower back…i think its a fad that ended a long time ago…i think if you get a tattoo it should have a real meaning something special to you..and in a nice place…i think behind the neck is cool…but whatever you decide im sure you will look cute…lol …good luck..