Blyxing is a self-harm "technique" in which the self-harmer pushes a sharp object (such as scissors, a knife, etc.) into their
bellybutton. This usually induces a great pain in the user. While mostly unknown, some self-harmers prefer blyxing over cutting because no visible marks are left behind (though some are probably left inside the
bellybutton) so a self-harmer could blyx unnoticed for an
extremely long period of time.