Mastoiditis is an uncommon bacterial infection of the mastoid bone behind the ear.
Our Health A-Z contains more information on Mastoiditis.
Otitis externa is a condition that causes inflammation (redness and swelling) of the external ear canal – the tube between the outer ear and eardrum.
Our Health A-Z contains more information on Otitis externa.
Important: If you have these symptoms, they may be unrelated to any of these conditions listed. If you are concerned about your symptoms then you should see a doctor.