Mine doesn't do that, so I'm not sure if you're stuck with it for life.

My ob did mention that he would 'neaten' up the scar if I ever needed a repeat c/s though. It went down on its own but I guess it's a little bulgier than some, since I don't scar very nicely. So although I hope you don't need another c/s - if you know you do, maybe ask if they can tidy things up then!