Iphone 3gs blue line on screen?

I have a blue mark down the screen it doesn't come an till i'm on the phone for about 10 mins, i have tried resting the phone and everything i have bought a lcd/Digitizer and i know how to put it on but it aint come yet but i was wondering if it is the lcd/Digitizer that is cosing?
Iphone 3gs blue line on screen

You probably dropped it

I can't remember but if i changed the screen would it go away?

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