Mine went away. But I don't know if that's the general rule for everyone. I've heard people talk about all the weight they've lost but they still have their double chin. Or their potbelly. That's my problem. I lost my chin, but my belly remains, lol.
Some people, like me *ACK* have a slightly recessive jaw line and tend to have a double chin even when skinny!!!!!!! It shrinks on me but never goes totally away......