Why is my LG G STYLO screen grey and faded

[Android Central Question]

Why is the screen on my LG G stylo washed out and faded? Ive had this problem on and off for the past year, but today after some shopping i pulled my phone out of my pocket and the screen was so faded it was almost completely white. I reset my phone with no change, then Took out the battery.again with no fix and its slowly getting the colour back but im concerned this is going to only get worse. Ive googled other answeres for help but i cant find anything. Also when i take a screen shot the image doesnt capture the "white/grey fadedness" so its only appearing on my screen. Help?!