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.
However, I occasionally get pain behind my right ear. It feels as if the pain/pressure is actually inside my skull, not just surface pain. I wear glasses, and I experience the pain more often when I am wearing them, but also experience it when I'm wearing my contacts. I've been experiencing this pressure for as long as I remember, and it is always behind my right ear.