Woke up with a black eye. Is this a sign of something serious?
Thank you for sharing your problem.
Waking up with a black eye could be due to issues such as insect bite or bleeding into the tissues due to side effect of some medicines or even due to alterations in blood clotting mechanisms. Is he taking some?
Most of the causes are benign and they regress on their own. I suggest that you see a physician to rule out above causes and I do not think he requires a ER visit. If the lesion progresses it can turn serious.
Please revert to me if you have any more doubts.