Suddenly a black hole and lines appeared on the screen, and it increased, and the phone was not exposed to any impacts or collisions, and the screen does not have any fracture.

It looks like a screen failure, but we, just users like you, can't diagnose your issue remotely.

Contact Apple Support (they have tools to run remote diagnostics) here:--> Get Support

or, make an appointment at an Apple Store or AASP (they are reopening after the temporary lockdown) and have your iPhone inspected.

Regards

Giulio