This one’s a bit strange, but works very well.
Make an onion poultice and apply externally over the infected ear. Cut an onion up, stick it in a hot oven until it starts to turn brown (make sure you set it in a glass pan to catch any juices, remove from oven, wrap in a piece of cotton or muslin, and apply.
You can also use the juice from the onion in your ear in the same way that you would Garlic oil. Works like a charm! The heat feels really good, too.