Galaxy a55 black dot problem

[velocity0918]

In my galaxy a55 , there is a black dot on the left side . The size of that hole is as same as the front camera. And whenever I scroll and touches my screen . The black dot appears

Is it a glitch or a screen problem ?? 

[Sanjit-]

Please restart once, then check, mine have same issue on all four corners of the screen after the 1st Beta update, but after restart this black dot disappeared.

[velocity0918]

Thanks brother
It works .
Hope samsung will fix this issue in stable update .