A small blue dot on the upper left of iphone 3g screen?

Thank you guys for ur replies but my question is still unanswered.
I know about the 'E' symbol turning circular and the three spots on the iphone screen. What I mean to say is that there is an extra blue spot (very small)which looks as if there is a dead pixel or something like that. it appears exactly below the Messages icon (if seen on the first page of screen). when I rub it few times it disappears for a second and it again reappears.

Any suggestions....