Samsung s8 screen problem: up to the phone app there is a ghost picture and remaining all the time. Appears in all colours accept black.
As a thought this could be screen burn in.
To get an official diagnosis then I would suggest to visit a Samsung Service Location or Samsung Experience Store.
Current Phone ~Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+ Samsung One Ui 2.5/ Android 10.