Yes, it is possible for you to get black eyes because of botox. The botox contains the bacterium which will be so invisible. That is the main reason for you to get the black eye. You should eat more food with vitamin C to moisture the eyes. The warm compress is also an effective and useful way for you. You could try to get rid of the black eyes.
All right, it seems that you are quite concerned about the side effects on your eyes by getting botox surgeries. Anyway, it is true that your body might suffer some minor problems but according to lots of cases, black eyes would simply not occur. If you get black eyes due to botox, you just need to consult the surgeon who operated on you, and pay attention to your eye health and body health in every aspect.