After doing some research, I noticed that a lot of people had believed that both boys had self harmed prior to the massacre.
Most evidence for Dylans was the phrase: "I was mr Cutter tonight..."
Dylans autopsy showed no real prominant evidence of self harm or cutting, however he could of done it in other ways. I believe that the phrase "Mr Cutter" had no real meaning behind it and that he just meant it as more of a casual term for someone taking (anti)depressants. Much like emo connatates to cutting and vice versa. Also when he mentions slitting his wrists, i dont think it was literal at all
As for Eric, His autopsy showed lacerations and cuts at the top of his left upper arm. I believe this could have been caused by shattering glass ect considering that he also had a broken nose for unkown reasons. I dont believe it was self mutilation, as his goals were to harm other people than himself. Also, there was no mention of self harm in his journal (unlike Dylan)
I just think it would be intresting to hear your opinions on these claims and maybe you guys could elaborate a little more :]
-regards,
Ella