That spreading scar is referred to as a “cigarette paper” scar. The skin continues to stretch and gets thinner and thinner. Common in Classical and often found in Hypermobility type too, especially in areas like the back and torso. I have quite a few of these.
The scars that are whitish (for me anyway) and raised like a bump are called “keloid” scars. I have these on my arms, especially my forearms.
Hope that helps.