Black spot on iphone 4 home screen?

Ok so the other day I dropped my iphone 4, and there was suddenly a black spot on the corner of my phone, but it only shows on the home screen? I've seen plenty of black spots on people's phones, but they always stay there no matter what app. It's about the size of the square inside the home button. Anyone know what's happening?

Hi there just follow the link i've put up for you and see if this does the trick… Bit of a longshot but how you are describing the problem you have this jumped right into my head.

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