I think your suggesting to ask for details on what he needs to report is a good idea. I know when I was in the er last doctor asked and I was honest but her reaction wasn't good and I think she was much less willing to listen or help me with another non related problem.
I cut just to cope and to try to prevent myself from completely panicking and going off the deepend I can't truely see it as horrible when it help at the time. The bad is how others react and look at me. Also trying to hide the marks can be hard.