Basically, BC stands for before Christ and AD stands for Anno Domini, Latin for in the year of our Lord.. The transition point between BC and AD marks the approximate time when God incarnate came down to earth to live with His creation.
The only area that is involved is the spot direcly behind my right ear lobe where it sinks in, not futher behind where the gland or lymph node is. I have gotten swollen lymph nodes before, this is very different. My inner ear, and throat and all other surrounding areas aren't in pain at all.
Needless to say, the right ear is located on the right side of the human body. It absorbs sound waves from the surrounding environment and transfers them to the brain, which are then perceived by us in the form of sound. There are different parts of the human ear, which work in sync for the purpose of hearing.