If you want to make the fake black eye, you could do the eye make up to get it. You could use the eye shadow with dark series color to make the fake black eye. You could also wear the sunglasses to cover the eyes which will make the fake black eyes be more alike. This will leave the impression of fake black eye more true. You could have a try.
All right, that is really sorrowful, isn't it? As a matter of fact, there are lots of reasons that would lead to black eyes besides being hit by somebody else. Anyway, from what I know, if you get migraine, which is a very complicated matter, may results in your black eyes. Also, some bad habits such as staying up late may also make the situation worse! Just try to take care of your eyes and take some treatment.