Bump on the head for 1 year?

Hey,

I've had a bump on my head for at least a year (if not more) that just won't go away. Lately, I've been having severe headaches, which has me worried it might be something more serious.

I always told my mom we should see a doctor. That never happened. Today, though, I insisted, and she said we should make an appointment.

Of course, no one here is a doctor, but does anyone know what this could be? It's rather hard, and when I press on it, it hurts my temples.