I recently found a "large" lump on the back of my head. The lump is on the right side, about an inch above my hairline. The lump is hard, I already made an doctors appointment for later this week, but I was just wondering if I was just overreacting. I basically never get headaches, but since I found the lump I have felt pressure on my forehead. I'm not sure if I'm just imagining the pressure and being paranoid. Can you tell me what it could possibly be? Thanks!