Yeah, I guess Doctors forget what things are called too.  

Have you ever noticed, while sitting in the exam room, that there are posters all over the walls?   Posters of human anatomy like your bones and your circulatory system.  If you are lucky you will actually get to see a little soft porn or as my Dr puts it "the reproductive system".  

You see, my Dr has never referred to said posters and I have been to see many doctors over the years.  Never once has a doctor pointed to something on the "Lymphatic System" poster and said  "see here, this is what is swollen up in you".  

This leaves me to only one conclusion.  Doctors forget what stuff is called.  These are your doctors 'cheat sheets'.  So the next time you catch your doctor glancing over his shoulder be advised.  He's just trying to figure out what your thingamagiggy is and why it's all puffy and red.