I don't know how old you are, but I'm guessing that you're a teenager.
It could very well be a pimple underneath the skin. Can you see it in the mirror? Does it move around with the skin when you touch it, or is it fixed? Is it painful if you squeeze it a little bit? There is a gland in that area too (there are actually TONS of lymph glands in the head and neck region), but usually lymph glands are softer.
Go to the family doctor, (s)he can check it out if you're worried. Assuming I'm right with your age, it's probably just a pimple. Head and neck cancers are not common in your age group.