Question White Marks on Monitor

Sep 2, 2019
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Hello,

Does anyone can explain me or tell me what those marks are in my monitor? It's really weird because the monitor as only 2,5 years and I clean it only with a cloth and water, and I dry it immediately.
In the picture, the black dots (surrounded by the red circles) aren't from the monitor, the marks surrounded by yellow are what concern me.
Follows the picture:

Thank you,

Tiago.
 

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