I'm pretty sure this painful thing on the back of my head (above the neck, under my hair) is a boil and not, I repeat NOT, a parasitic twin. Possibly. (Though the twin thing would be awesome, if it were an eyeball. I would have an eye in the back of my head. I could give people the hairy eyeball glare.) But it's really painful and I would not be surprised if a molar or an eyeball popped out.
Boil! Isn't that a middle ages thing? Or for old people?