Thinking bout, Time Scars, Sans’ is definitely, god awful to look at. Or it was, at least, it’s, healed sorta, it helps that he’s not getting in FIGHTs all the time, but it’s still, a giant slash across his ribs, pretty much goes from his right shoulder to his left hip, about at least, it went through his ribs eventually, but not like, all the way through his spine and everything, so he can’t like split into two pieces, it just, really hurts sometimes.
Then there’s Papyrus’ which isn’t really noticeable unless you’re up close at his neck/spine and see it doesn’t really line up correctly . It’s ‘fixed’ so his head, stays attached to where it was cut off several times, but overall he probably lost some of his neck/spine, like i dunno, half inch or something.