Infection of the mastoid bone (see Diagram — Anatomy of the Ear) is now very rare, this was more common before antibiotics were invented (1930s, mainly late 1940s).ย  It causes chronic fevers; the bone behind the ear may hurt when tapped on.ย  Diagnosis requires a CT scan.ย  Mastoiditis can cause major destruction, and requires weeks of treatment with IV antibiotics.

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