Why Do We Get Bumps On The Tip Of Our Tongues?

United States
@wmg2006 (5386)
January 5, 2007 10:38pm CST
I get a bump on the end of my tongue sometimes and it hurts like someone has cut it open for surgery. Why does this happen? I have not bitten my tongue nor have I told a lie. My Mother use to tell me this, but she was wrong! I cannot find a reason for this to happen. Any suggestions? A friend says it is from using your tongue to get things out from between your teeth. Can that be it?