Hey. I was hoping I could add a bit of light to this situation. I'm sixteen, I've been dealing with depression, mild OCD and anxiety problems and turned to cutting about five years ago. The reason I did it was because it was something I could control. God bless my family, but it was something that they couldn't touch (they've always been extremely over-protective). I remember times getting so angry, and knowing I couldn't express it because 'you can't make waves' and all that, that I took it out on myself rather than speaking up for myself.
Not to say you do, but don't treat your son like he's crazy or a freak. I understand how painful this is for parents, but I know at the time I felt like my actions were only affecting me. It's my body, my time, you know. I still have the urge to cut and cause other harm to myself (I leaned towards burning a lot of the time) and have relapsed. It's like any other addiction. Good luck, and I'll keep you two in my thoughts.