You can apply lemon on the scars. Thanks to the hydroxy acid content of the lemon, the dead cells will be removed from the skin and new cells will be formed.
Since the lemon is also a bleacher, it bleaches the color of the scars. This way, it reduces the scars. If it is applied regularly and properly, the scars will fade away over time and eventually will disappear. This way, you can treat the scars by a home remedy.