My Sprint Diamond Has Worms :)

[Biker1]

I just noticed in the center of my touch screen, approximately 3/4"x1 1/2",
there appears to be moving things within this rectangular area.
I can see this under certain lighting and when the screen backlight is off. But I can also see this when the backlight is on if I angle the screen in certain positions.
I never noticed this before. It is subtle yet noticeable at certain angles.
It looks like tiny worms that are movig around. Like I said, most of the time it is not noticeabe unless I position the screen at certain angles or under certain lighting.
Is this a pixel or touch screen issue or is this normal?
I would like to know so I can TEP my Diamond if I have to.
Any input is appreciated.
Edit:The little things only move when I move the Diamond. It is like a rainbow effect, like oil on water. Does not interfere with what is on the screen though. All text and pics are clear. Usually when there is something wrong with the crystal on devices , it interferes with what is being viewed on the screen. Again, any feedback is appreciated.