That is a horrible situation you're in. Hopefully you get the help you need regarding your harassment and are taken seriously. I think seeking medical attention about these wounds ASAP is a good idea too. That was what happened when I self harmed, otherwise I'd have suffered a nasty infection.
I say this entirely based upon my own initial thoughts, but it might be worth it to seek out support groups/coping mechanisms to stop self-harming happening again, especially if this isn't the first time you've done so. It might also be worth it to find some alternative to deal with the pressures of self harm?
I don't know which country you live in, so I'll say that checking the recovery section of this website is a good place to start.
I'll not say any more, considering this isn't my area at all. I wish OP well regardless in dealing with their harassers.