You're going to wind up being hospitalized or dead if you keep on down the destructive path that you're on.

okayy, cat or dog at your house? Maybe blame that?
You could be working on an art project.. What i did once was draw on a red line and smear it infront of my mom, saying i just drew the lines on..
Sorry If this all sucks :(
Buuut maybe you should be some disinfectant, thats what i have for my cuts

Hope everything goes well

that might help except
1)i dont have a cat
2)i dont have a dog
3)i dont do art
thanks for the ideas anyway. she guessed whats going on (wel, not why i cut my arms, just that i cut them) and shes going all pyschopath motherly on me one of my friends is going to bring some cream to school tomorrow (if she remembers) for me

um... stop?
i used to cut. like 8th grade. i remember those days.
trust me you'll feel totally better when you have control of your life. just try.