User can create scars

Pros:
-user can do this subtly
-user can read the story of scars
-user can control pain of target
-user can make the scars change pattern of scars when needed

Cons:
-user can only do this subtly to not raise suspicions
-user will do this at touch
-user can't do this with no pain
-user can only do this with their own scars

Weakness: overuse
User gets painful scars from overuse of quirk