My husband has this knot on the right bottom side of his head near his ear that randomly comes up once every month or so, it starts out like an itchy spot that turns into a rather large lump that goes away after a few hours, he says that it's tender to the touch but not really that painful. It happens in the exact same spot every time. He doesn't really get headaches except when he stares at the tv for too long (he has a bad left eye that he doesn't have contacts or glasses for) What could this be?View Thread