reading a little into your post with my interpretation of "pops out"... i would hasten a guess that it is a "stuck" pixel on the CCD, i.e. you would likely not see it when you view the initial review of your picture. but it will only appear when you zoom and pan into it, always in the same spot on the image (or sensor).
if it is a "stuck" pixel on the LCD screen, you wouldn't have to do anything, and it's always there at the same spot on the LCD screen when you zoom or pan.