I need some advise, I recently noticed some bright spots on my iPhone 7+ screen. They are towards the lower portion of the screen and very visable with white or plain backgrounds. I noticed them a few days ago and I'm wondering what they are, or if my screen is failing. In the picture linked below they are extremely hard to see however, in person they are very bright and I think they've gotten brighter since I first noticed them (though I could be looking too hard now that I've noticed them). Any advise is appreciated.
https://imgur.com/a/tcGmRQt
https://imgur.com/a/tcGmRQt