Help IPHONE HAS GRAY SPOTS

My iPhone 3GS has been cracked for months but last bpnight it was normal and I unlocked it and it was all white it was like that for ages the phone rang and I could hear stuff just nit see it than it came back on but with a big Gray spit covering some things it works fine over the spot I just can't see ans it gets bigger/ moves around. What is this and waht do I do

Water or dust might have got through the cracks and ruined the screen. You could try restoring it to factory settings through iTunes but it probably won't help. Mate, fix your screen before it stops working entirely.

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