Question What is this defect on the screen?

[egantz09]

These small whitish bubbles have slowly appeared on my screen, what are they and how can I remove them? It's an Acer x233h display.

 

[Ralston18]

Much more information needed:

Full hardware specs and OS information.

Make and model display? Age. Environment. Connectivity?

Some photographs may help.

http://www.tomshardware.com/answers/id-2173703/post-images-tomshardware-guide.html