i say, dont worry about it. In a mater of days, the pixel and you will become family.
i have 4 dead pixels on my Macbook myself, just 2 pixels shy from the minumum limit to request a screen replace, and its not bothering me one bit.
I used to exchanged my MBP twice just for two stuck pixels but now I've learned to live with them since most MB or MBP have this "defect" on the screen. (From all 7 MBPs and 2 MBs I purchased, 5 of them had more than one stuck pixel)
This doesn't sound good. Is this really a common problem with MacBooks? I'm looking to buy one in the next few weeks.
I just noticed one on my machine too, and tried pixel fix and 'massaging' it. but nothing. it's white, i see it sometimes and other times not. I also tried putting clearasil on it. but that didn't work either.