Yellow Spot on Iphone 4 screen?

The other day i had my iphone 4 screen replaced as it had a small crack. However, today there has been a yellow mark appear on the bottom left hand corner which is clearly to do with the new screen. I was wondering what this is, if i can fix it and what i should do? Can i take the phone back to the phone repair shop? I don't understand where i stand:/
SOMEONE ANSWER MY QUESTION, THEY NEVER GET ANSWERED!

My i phone screen went white one day and I had no reason why. I took it to the repair shop and they managed to fix it but it did cost. You could try googling the apple forums and they may be able to help

http://cosmocentro.com.co/

Its a dead pixel, don't worry, they usually don't harm your screen, but you may want to get either the screen or phone replaced if you don't want it to just die on you one day

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