About four days ago, I had a small tender spot

Patient: About four days ago, I had a small tender spot on the back of my head at the base of my skull on the right side. It almost felt like a BB or something. The next morning, that pain was then starting about an inch or two higher from the base of my skull. It also hurt worse than it had. Now, it is day four where I wake up with pain about two square inches in that spot. However, by the afternoon, it’s back to only being the small BB spot that hurts.

Doctor: