There are varying types of self injury.
The most common is cutting. Making up 72%. Followed by burning at 35%.
I would say its usually not something that only happens once
Its not something medicine alone will help. If the underlying cause is depression or bipolar
or something like that, then yeah meds will help but most cases are a lot more complicated than that and everyone who self
injures needs therapy. If for nothing else to learn other ways of coping