i can't examine you so i have no way of confirming or disputing the diagnosis but there is a sinus (mastoid sinus) located behind both ears. the bony prominence that you feel. the mastoid sinus connects with the middle ear so usually there are ear-related symptoms. there are also lymph nodes in this area.
can a sinus infection cause pain in the back of the skull. i have had this infection for three to four weeks now. due to the holidays i didn't get to see a doctor until last week. he said there was a sinus infection and some inflammation and prescribed an antibiotic and a steroid dose pack. the pain is on the left side behind the ear. it hurts sharply when i bend over or stretch forward. at first i thought i pulled a muscle in my neck while working out doing shrugs but the pain won't go away. gland inflammation or pulled muscle?