It showed up a couple of days ago right in the crease where the ear meets the head, just above my earlobe. The bump is about the size of a pea and just under the skin. It aches constantly and is especially painful when touched. What could it be? It's not a pimple, and I'm fairly certain it's not a swollen lymph node, because I've had swollen lymph nodes behind my ears before and they were never this painful. Someone on another board warned me that it could be cancer, but I'd like a second opinion. Should I see a doctor?