Phone LED Screen Burn-in ? I don't recognize the icon that's burned in.

capguncowboy thought this was worth mentioning said
5

I have a Samsung Galaxy S7. I’ve had it about 16 months and I bought it new. Recently, I noticed the screen is beginning to burn in. However, I don’t recognize the icon that’s burned in. It’s a chat bubble. I’ve never seen it before. I have checked all of the apps that I use, and all of the icons on the desktop – none of them come close. It looks like a chat bubble with 3 dots below it.

Anyone else having issues?