Apparently self-injury is common in people with DID.

I just wish I could fight the feelings more than I am able to. Sometimes it's the only thing that makes me feel 'real' in an unreal world. Makes me feel better, more in touch with things, more HERE instead of so fragmented. I've successfully fought off the urges about 5 times so far since my diagnosis...and I'm proud of each time. It was embarrassing when I had to go for blood tests yesterday and my arm was all scarred with long straight lines. The technician didn't say anything but she did see and I just looked away. There are some things that are so broken that they cannot be fixed. Ever.