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 right upper lobe is one of the largest lobes of the lungs and is located on the anterior surface of the chest, taking up most of the space here. On the other hand, the inferior right lobe is primarily located towards the posterior surface of the chest and very little is projected onto the anterior chest.