I have a small white square on my screen - it doesn't drag open or move, 21" iMac (mid 2010)

Just today I noticed a small pale white square on my screen. It's fixed in position, doesn't drag wider or open up anything.
iMac spec is 21" mid 2010 updated Xmas 2014 to OS X - Yosemite 10.10.1, 3.06 Ghz Intel Core i3

Howdy yogadude,
Welcome to Apple Support Communities.
It sounds like the small white square on your iMac's display may be a pixel anomaly, take a look at the article linked below for more information and possible solutions.
About LCD display pixel anomalies for Apple products released in 2010 and later - Apple Support
Cheers, 
-Jason

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