What's this bump on the back of my leg?!

Question: What's this bump on the back of my leg?

I had this bump since 1995, and have no idea what this is or what caused it. Should I be concerned ?
There is no pain associated with this bump.

http://s698.photobucket.com/albums/vv343…

Answers:

read a bout : open the third & fourth link on : Www.cancer-tips.info

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What's this bump on the back of my leg?!

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