Scared. Is this skin cancer?

I am skeptical that it is any type of cancer. That is so unlikely so don't spend another second worrying about that. I can't diagnose it through a computer, but my guess is that it is some type of bacteria or worm that is causing the discoloration. Tell your parents you need to see a Dermatologist, and they can tell you exactly what it is and give you a powerful ointment to completely take it away. Just make sure you make that appointment as soon as possible and don't worry you're much too young to be thinking about cancer!