Interesting. We get two different kinds of self-injury behaviour in this chapter: suicidal and attention-seeking.
There are other kinds as well, such as the kind where the pain (physical or emotional) is sought to fill an emotional void within the person, or where it is intended to distract from other uncomfortable feelings. There are also those who self-harm to "punish" themselves for something they perceive as a mistake or a bad behaviour, and the kind where violence (again, physical or emotional) is turned inwards in order to avoid hurting others.
When treating self-harm behaviour, it's important to understand what triggers it, why the person harms themselves. Also, not all self-injury behavior takes the skape of cutting, although that is by far the most recognisable type. It can be other forms of physical harm inflicted on oneself, which may or may not leave scars, and it can also be other types of risky behaviour of many different kinds that has the potential to harm the person. It is not always easily recognisable as self-harm.