Question Monitor Stains

Mar 11, 2021
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There are stains inside my monitor.

(LG FLATRON W2043S, a ~10 years old monitor)

This happened last year when i was travelling for a few months: When I came back home, I've noticed a stain inside the screen. Now it happened again, I was away from home for ~2 months, but this time it has gotten even worse (see images below).
I think it could be dead pixels (due to the screen being off for a long time) or dust inside of the screen. If it is dust, can it be cleaned (at a technical assistance) ?
 

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