The fluid can appear yellow, or red like blood. It can even be quite dark like oil. Typically, this is due to a seroma or pocket of fluid in the skin layer or even a stable clot of blood which has formed in the skin layer. Rarely does it mean the fascial or muscular wall closure has been compromised. The volume of fluid can be profound. Rarely does it need immediate attention. Cover the area with several sterile guaze pads and call for an asap appointment.