question: Hi 2 weeks ago i noticed a small hard lump om the left side of my neck arpumd the size of a small pencil eraser. It was painless so i forgot about it. But today ive had a throbbing headache and i found a similar hard lump on the bottom right hand side of the back of my head. So i checked the one on my neck and it has grown to the size of half my thumb. I havent seen the doctor yet becuse i dont know if this is bad or not. Should i see my doctor? Is this serious.