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.
There are many things that could be causing your pain. The area right behind your ear is called your mastoid bone, and when people get ear infections, that bone often becomes involved in the inflammatory reaction as well. Sometimes, pustular fluid can remain in the mastoid long after the ear infection has resolved.