Ive been getting something weird in my screen and would like to see if this happened to anyone...

Ok, not long ago ive been getting a weird rainbow colors in my screen like liquid inside it, i get this from time to time and mainly in somewhat cool temperatures but it goes away after a while but it keeps coming back and fourth, i mainly see it when i turn the screen off and the gooey substance inside the screen moves if i touch it i never gotten this before and whould like to know what is it or why it happened, does this mean that the screen is damaged or there is something wrong with it?? Can i get my device replaced for this??? The screen works fine by the way

Thanx in advance

Ill see if i can catch it in a picture to show what im talking about