Dropped phone in toilet?

Alright, so exactly 2 weeks ago i dropped my iphone 8 plus in my toilet for all of a second and a half right before i had to leave for work. It slipped out of my back pocket, i immediately grabbed it out and dried it off. Changed the case, used a clorox wipe to get rid of any bacteria and did a quick internet search and it said my phone should be fine.

my phone worked good all day until i got home when i started to notice an increasingly bigger patch of something under my screen. I began to panic. I did some more research and found out that my phone did somehow get water damage. After further analysis i figured out the screen replacement i had done by Best Buy four months ago probably voided the waterproof seal on my phone. I stuck it in a bag of rice for 36 hours, took it out, and it was good as new. Water was gone, audio, cameras, and screens were functioning perfectly. I was relieved.

and then, last night i started to notice an imprint under my screen from where the water marks were two weeks ago. My phone is still working perfectly fine, and i have to have full brightness on and be on a white screen to see the marks but nonetheless, they're there.

does anyone know if this is harmful? Do i need to have this fixed? Will my phone stop functioning soon? I can't afford a new one at the moment so if there's any affordable way to fix it i'm all ears.

You could take it to a repair shop for an evaluation. They sb able to tell you if this is just a "stain" from where the moisture was, or if this is a problem. It doesn't sound like it has interfered with the phone operation.

You should have Immediately taken it to a phone repair specialist.