As @uncfnp said, MIDDLE EAR (not outer ear) infections are a result of poor equalization. Blood leaks into the middle ear from the barotrauma and sets up a field for infection. You really need to concentrate on equalization.
"Early and Often" means > at the surface, and every 2 feet down to 30 feet, where you can carefully back off.
ANY PAIN AT ALL > STOP!!!!!! Ascend until there is no pain and pressure, and.......gently.....try again.
You should be clearing with ANY hint of pressure.
Go as slowly as you need to.
Practice numerous times during the day prior to a trip. If you can't clear on land, you can't clear in the water.
Good advice on equalization. I think what my Carolina Blue colleague @uncfnp meant is that middle ear barotrauma symptoms are sometimes mistaken by divers for middle ear infection. Barotrauma is not a prerequisite for middle ear infection.
Best regards,
DDM