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Scars form because the body duplicates the lost cells from what still exists with it. What it ‘remembers’, effectively. Over time, these cells begin to change, and as such are no longer ‘clones’ of one another, causing the scar to fade, though not all do. So, in theory, their scars from before and after their turn would be fading at an accelerated pace.

That said, for humans, wounds that are superficial rarely scar. For a werewolf, a ‘superficial’ wound could be slightly deeper.