Screen colors change during use

Hello all...

A recap: I dropped my phone and it hit the floor. The screen didn't crack and all works well..... Except for the different color "cloud" that appears. I am guessing its color is dependent on the color the screen is trying to create.

The cloud starts out small and as I use the phone it becomes larger. I'll put the phone down for a while and the next time I pick it up the cloud is gone. Then as I start to use it, it returns.

I opened it up, everything is well seated and connected. I don't know if this is a screen problem or something else. I know it's not BSOD.

Thoughts?

Thank you in advance,

So1oM