Weird circular spot in middle of display Descent Mk3i

Hello everyone,

I have noticed a small circular anomaly in the middle of my Mk3i display. When I clean the display, it disappears, but as the day goes on, it reappears.  I have attached a couple of photos that will hopefully explain what is going on with my watch.  Does anyone have any idea what is going on here? This does not seem (emphasize seem) to hinder any functionality with the watch, but I have not been able to dive with it yet to see if I have any issues during diving.