Antibiotics poss req: Behind ear is the mastoid sinus. Infection in this sinus can become serious (called mastoiditis) because so close to brain. Must be evaluated. If a nearby major Hospital, best choice: go to ER because CT scan may be required. Otherwise go to ENT doctor I recommend do so right away. A big Hosp will have a fast low radiation CT. I'm not 100% sure this is diagnosis, but you must get eval rt away.
Answered 4/23/2016
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