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Is it a Sony's Dock or a third party dock? either or contact your Local support to get your device inspected.
Hi @Jason4,
Welcome to the community.
What you are describing sounds like screen bruising. It is usually caused by force or stress at a specific point on your display. Uliwooly is right, the only way to resolve this will be to contact your local support team as it is a physical issue with the screen.
Same here and no issues, if it was caused by stress, perhaps the user had a screen glass protector or case and maybe it didn't fit properly, perhaps it was too tight, too many probable causes.