Someone with a black eye means that he has gotten a periorbial hematoma, in other words, there is ecchymosis around his eye and the color of the ecchymosis often manifests discoloration purple black and blue, which is just like a part of one’s body bumps into something hard, it would be covered with bruise. And the black eye is usually caused by an injury to the face, especially the area around the ocular region. Therefore, your friend with a black eye declined your invitation in fear that he looks terrifying and bad. Usually, the black eye is not serious and disappears within a week and you can invite him to go out at that time.