A concept from Roland Barthes' book Camera Lucida: Reflections on Photography.
1. To wound.
2. Denoting the wounding, personally touching detail which establishes a direct relationship with the object or person within it.
"Yet the punctum shows no preference for morality or good taste: the punctum can be ill-bred."
Roland Barthes - Camera Lucida: Reflections on Photography (Page 43).