Imac screen condensation

the imac stood unused in an unheated room for some time.now there´s a layer of grey,what seems to be condensation under the screen,covering half of it.do i have to be worried?
the shade was not visible when i turned the imac on,and seems to decline (maybe).
does anyone have experience with this appearance,and what should i do?

I was surprised that it was there, and I was relieved it is gone.
Under bright light reflection, take a look again. The 'wet' mark is gone with no water visible under the glass, but you can see the cloudy mark from the water marks.... So it is not totally as before it went into condensation.
I used a window light to see this, you can use a bright torch also may be.

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