Self-mutilation.
A controlled study of self-mutilators found them to be significantly more introverted, neurotic and hostile. They report excessive physical punishment in childhood, sado-masochistic fantasies and more suicidal attempts.
D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010554:Personality Disorders / Q000523:psychology*; D010555:Personality Inventory; D012652:Self Mutilation / Q000523:psychology*; D013406:Suicide, Attempted