While calling a square shaped 4 dot flickering on my s23 screen.

[Sanu1994]

While i make calls there is something flickering on the screen besides of (calling...). Just like poximity sensor. It acually looks like 4 dot arranged in a square. Anyone know what it is. 

[Sanu1994]

Right here marked with red circle.

[Aayu23]

That's under display proximity sensor

[Sanu1994]

But the proximity sensor is located beside of the front camera module right. This is actually little bit down. Exactly just look at the screenshot that you can find calling... witten. It appears top of that 3 dots.

[samfan91]

Open phone diagnostics->proximity recognition and touch that area, if the screen goes black then it's a proximity sensor.

[Sanu1994]

Yes it is proximity sensor. When i open the phone diagnostics and try to run proximity sensor check I can see that the sensor start to blink in the same area where I circled with red colour in the screenshot that I upload.
So issue solved.
Thank you @Aayu23 and @samfan91 for your reply.

[Irfix]

I can't understand do you send screenshot?

[RvB]

Same thing appears on my screen too. Showed nearby service centre and they said it proximity sensor and nothing to be worried of