Corrected entry: Wikus is running away in the suit, after the alien that he is helping is captured and on the ground surrounded by the MNU forces. Just before Wikus comes back, there is a shot of the alien with what looks like red blood around his left eye. In the following shots, like in the craft, the "blood" is now gone. Also, near the start of the movie the alien blood is established as a black color, so shouldn't be red around his eye.
summoner2100
22nd Aug 2009
Correction: You're assuming the red is blood and that it belongs to the alien. There was plenty of human carnage in that scene to account for red substances on anyone.
JC Fernandez