Some scars can eventually go away after years but most scars stay with you forever and never go away.
You can help reduce the appearance of some scars by applying some fade balm or Hydrolized Collagen Gel to the scar daily.
But most scars will never completely disappear once you have the scar.
I have a scar on my arm from getting cut years ago when I was 5 years old and the scars has never even faded but that's okay.