Hello, About a year ago I was diag. with a lesion on my brainstem. I go in a week for another MRI to see if it has changed any. But I have noticed that about 1-2 times a month, I will get this sore spot on the top of my head. Its about the size of a half dollar and kinda feels like it is a little swollen. It feels like you would if you had bumped your head on something, but I have never hit my head on anything. Does anyone know what that could be? Thanks for any input