Jenny, I have to insist that this is an issue for a vet. We are not a substitute for one and can’t tell you how to treat him, especially with something more serious than a cut. Just check the list of vet resources (see our link above) and call a couple to ask fees and payment plans.
I had to delete your age in your post because we don’t allow it for your own protection. Also, if that’s your real last name, you will need to change that, too. Again, it’s to keep our members safe since this is an open forum. I’ll alert BB to contact you to see if you need the name change.
Because of your age, you are probably not the adult responsible for the well being of your bunny. Parents or adults in the home are legally responsible for pets of those under a certain age, so if you have an adult in your home, please ask them to get the bunny seen by a vet and set up medical care before September. Vets will arrange payment plans, too.