In the present study, attempts were made to clarify the characteristics and the background information of persons with antisocial personality (disorder) who had resorted to slashings. These were compared with controls with a similar personality disorder who had not resorted to slashings. It appeared that the former had been more often prone to repeated outbursts of rage or fighting, drug abuse, and even other forms of self-destruction as well as tattooing in prison. They had more often had an alcoholic father. Moreover, they were more withdrawn, anxious and had a tendency to blame their environment. They had more often made efforts to get out of the restricted milieu of prison to the prison's psychiatric department and experienced the confined space of the prison as oppressive. They resorted to slashing usually in prisons and it seemed that the restricted environment with an absence of sufficient stimuli was crucial in triggering self-mutilation.