This seems a lot like a hardware issue that can’t be fixed or worked-around.
If you have this issue and can’t stand it take a photo of it and send it to support to get a replacement phone/screen.
my phone is now 13 days old and in principle i am very happy with it.
But since three days there is a bright spot on the display. It is about 2x2 mm big and everytime a bit brighter, than the rest of the display. In every color.
It seems like a background diode gets more power.
In the beginning i thought i can ignore it, but it is so annoying over the time.
Have you ever heard of such a problem?
I contacted the support, but they did not answer.
I dont know weather this goes with warranty or not, so i just panicked and send a refund request before tommorow the 14 days are over.