It would have been ridiculously normal wouldn't it? Course I think what it actually is is probably pretty normal as well, though maybe not AS normal ... if it makes you feel any better there is the potential for this to not be "just a cyst" but rather a dermoid cyst which:

"These cysts contain many types of cells. They may be filled with hair, teeth, and other tissues that become part of the cyst. They can become large and cause pain."

To which all I can say is EEEWWWW!