A bump on the left side of my neck?

I have a weird bump on the left side of my neck. its right under my jaw... on my neck... a inch and a half from my ear. The size is about from the tip of my index finger to the middle crease in my index finger. u cant see it... but if u feel that part of my neck its OBVIOUS that there is a wide bump... and it doesn't hurt. i don't even notice it unless i touch that part of my neck.