2008 D Cent Dot? Know Variety? Or Hazard?

Just water spots. If they were a lot smaller, they would be sneeze droplets.

I definitely see what coop is referring to on your coin and he is absolutely correct. Any type of small moisture drops or bodily fluid contaminates on a shiny BU coin will no doubt cause discolored spots that cannot be removed. Believe me.... I learned the hard way. I do see the 'dot' you are talking about to the left of the mint mark. I'm thinking that it may possibly be a plating bubble or blister being that this is a Zinc cent. It looks like there may be other small bumps on your coin as best as I see which leads me to believe this is a plating issue. It appears there is a small black hole in the dot you are referring to which would further mean it is a raised bubble due to the copper coating on a zinc cent. Hope this helps.