Default [Q] pink/purple tint blotch on top left corner

so this appeared out of the blue

no drop/water damage I can think of

is there anything to be done? should I put it on rice or something? it already spread a bit since it first appeared

for context on the other scratches and that little blue spot: the screen did shatter almost 6 months ago, and I got it replaced. The replacement works fine but those blemishes and that little spot stayed there. Since then, nothing else went wrong with the phone till I woke up today and that pink blob appeared

what should I do, if anything