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.
The space behind the ear, just a little above the earlobe, hurts after feeling around. I don't think it could be swimming, but who knows, the water was a little... dirty. This happened nearly a week ago. I've had a history of issues with my right ear and I think because of it wax builds up faster than my left.