A green growing stain on the display of your Samsung Galaxy J5.

Hello, three days ago, after waking up, when I unlocked the phone, I noticed a small purple spot in the lower left corner of the display. This surprised me because the night I used the phone, she was gone. At first it didn't bother me very much, but day by day the stain began to gradually enlarge and turned green. It is visible especially when the screen is bright and on a light background, it is invisible on a dark background. My phone has not dropped recently, it has not been in contact with water, so I do not know what it may be caused by. It is under warranty, but I am worried about the fact that I have had a crack in the upper right corner for several months and I do not know if it will be accepted for warranty in this case, even though the crack has nothing to do with the stain: / Has anyone had a similar situation?

Damaged display, complete front to be replaced. Over time, the "stain" will enlarge and cover the entire display. Not covered by the guarantee, for example due to cracking. It is worth to save the data while you can see anything on the screen because sometimes it is a matter of several hours, sometimes several days, but there is no need to count on improvement.