For about a month now I have had this hard knot located
behind my
ear, its very, very sensitive. Also, I have noticed that I have been getting headaches frequently and its very hard for me to concentrate now. I don't know if that is because of the knot.. I have been researching seeing what this could be and all I have found is cyst or a tumor. So, please tell me what you think this is. I'm very worried, I am fifteen. I am planning to go to the doctor soon.