Scarification raises questions regarding physical and psychological limits, limits between the internal space and the external space of adolescents. They also question the narcissism and the representation of the body. Thanks to interviews with suicidal adolescents, we broached the performance in the real of psychical conflict. Through scarification, adolescents symbolize dividing lines in space, time and in their relationship with others. The thought following the action therefore helps to start a psychical work and restart the thinking system.