It could be by cutting, scratching, picking, bruising, etc.
Most Helpful Guy
That they are in pain and need help.1
Most Helpful Girl
They need help. Like, not necessarily a therapist, but they need people who genuinely care about them to support them and not judge them and help them through whatever it is that's wrong. Not saying it's that easy for people to do it, but very rarely can self harm or suicidal people help themselves alone and get better.1