Possible screen hardware fault - three perfect circles look like suction cup marks

I have an iMac 27-inch, mid 2011. I purchased the machine in October 2011.
I have always looked after my screen by protecting it from dust with a light cover but suddenly today I notice three perfect circles - like suction cup outlines. Two of them are identical in size 5cm across sitting side by side. The other one is in the left bottom quadrant and is about 3cm across - looks like there may have been writing across the top arc but is too small to make out.
I am assuming these marks are from the manufacturing/assembly process when the glass was suction-cupped to put onto the machine. Why have they become visible suddenly now nearly 4 years later?
I tried to clean them off with a isopropyl alcohol free wipe but nothing comes off. The circles are also casting a shadow onto the screen contents. There doesn't appear to be any raised surface to these marks.  They don't budge. But now I have like a white cloud of where I tried to clean them off when the screen was on and hot. I'm hoping this doesn't last.
What can I do?

Additional note to my above query...
The screen has a large amount of what looks to be condensation - that appears like a big milky cloud - this slowly shrunk and then disappeared after shutting down.
How is there condensation in the centre where the circular suction cup marks have suddenly appeared? Is my screen laminate separating or something?

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