I have a cyst that appears on the back of my left earlobe every few months. I'm quite fond of it, I like to burst and drain it whilst sitting at my desk. It's a shame it's only around for 5% of my life, I miss it when it goes, fortunately it is here at the moment.
Do you have a favourite cyst?
(actually, might not be a cyst but let's pretend it is http://en.wikipedia.org/wiki/Cyst)