Around 6 months ago I noticed a bump on the crown of my head. It's about the size of a half dollar. I thought nothing of it at first and blamed it on me being unobservant of my own body for 22 years. Recently, it has become sensitive, but not painful to the touch. I have considered this lump sensitivity to be everything from where I wear my pony-tail to a brain tumor. I have terrible allergies and get headaches and migraines fairly often. Since my bad allergies cause things like fatigue, foggy concentration, head/sinus pressure it is hard for me to recognize any other symptoms I may be having due to this mysterious lump. I am pretty concerned about it but am hesitant to bring it up to a doctor in case I am over reacting. Any information you could give on these types of lumps that are sensitive that could potentially cause headaches and fatigue would be greatly appreciated. Thanks.