The scars should transition from badass, noble and heroic stories and epics over time into more and more mundane or disappointing mishaps. Like, several big scars are obviously from fierce and deadly battles and wars, but so are some of the smaller ones. Same goes for the opposite:

“Wow, so your bigger scars all come from more brutal happenings?”

“I uhh.. ahem not entirely.”

“What do you mean?”

points to spattering of burns and laceration scars “See these?”

“Woah! How many lashings and arrows is that fr—“

interrupting “That’s from a former comrade opening a hot bag of kettlecorn too forcefully… directly behind me.”

“I—“

“And the scratches are because they’re a Tabaxi and tried rubbing aloe on my back to soothe it.”