How to remove old scars in the legs?

I have this friend of mine who has a lot of scars in her legs. She is so depressed. I told her to apply ointments but she said that she always does but the scars won't fade. She had this when she was still 8 years old and now she is already 19. A certain insect bit her that caused the scars. Can you suggest anything or any way that will remove her scars in her legs? The less expensive way maybe?