A few months ago I discovered a nickel size bump on the bottom right side of my head. At first I hadnt thought much about it but then i started noticeing that I had started getting headaches more freqauntly and when this would happen the bump seemed to expand into a qaurter like size and begin to stick out alittle more. Now, it feels as though its moving toward my right ear. Every now and then ill make estimations of it and compare them to the last time i checked. I am almost 14 years old and have been diagnosed with cronic migranes that cause me to loose sight in my eyes but my doctor never said anything about having bumps on my head. I was born with one bump on the top of my head but every doctor I have been sent to says its not anything to worry about but with this new one that has just appeared I am becomeing very worried exspeacially since its growing in size. what could this be and should i seek medical help