If your self harming you need help. Talk to a counselor ,teacher etc
my teacher looked at my wrist and gave a a dissapointed look all throughout the day. do you think he saw my cuts?
Could be, but you know people are going to give you multiple looks of disapproval, bewilderment and shake their heads at seeing your cuttings.
As Otis stated, you need professional counseling immediately.
Yes he may be calling your parents or cps to check in on you for injuries to your wrist. If it happens take it as a blessing. You need help.