How do you get rid of old scars or reduce the size of an old scar?

are there any home treatments that i can use or even medication? and these are old scars not new ones. thankss|||Vitamin e lotion and a cream called Moderma. It cost around 25 bucks, but is very good in shrinking scars and marks.|||you can use this stuff called Maderma it works great on scars it even minimizes stretch marks thats how good it is