Cutting is actually really popular amongst teenage girls, most of whom have severally low self-esteem. It happens when emotional pain is too much to deal with, so a temporary 'quick fix' is to cut. Physical pain is a lot easier to deal with and used as a distraction. The intention is never to kill yourself. Another name for this is 'self harm'. It can eventually lead to suicide if not dealt with.
well i knew someone who did this, and she did it secretly....while others do it for attention, the reason is most probably similar like everyone elses who hides it......depressed, seeking attention because of this or loneliness......but it needs too be reported, as this is some kind of an addiction.....one keeps on cutting it deeper with time....just like weed:D...the amonut of stuff keeps on increasing.........either help her out yrself or report it.