Power off the laptop and unplug it
Let the screen cool down completely
Gently wipe the screen with a clean, dry microfiber cloth
Check the marks from different angles and lighting
Apply light, even pressure around the affected area only if the screen is off and cool
Massage the bezel area near the mark very gently
Use a soft cloth to avoid scratching the display
Leave the laptop closed for a few hours to see if the marks fade
Restart the laptop and recheck the screen
If the marks remain, stop pressing on the screen
Avoid using heat, liquids, or harsh cleaners
Have the screen inspected or replaced if the marks do not go away