Yes, egg can help you reduce black eyes. But it can' t cure black eyes. And you shall not use raw eggs to treat your black eyes. You shall use a cooked egg. And then remove the egg shell. Now, you can use the egg to roll it on your black eye lightly. It works well to reduce bruise and puffy skin. Except egg, you can also use cold compress to help black eye. Also, taking vitamin C can help heal the black eyes.
I have to say that it is an old but very useful idea. Although there is not obvious evidence can show that it works well. But you can still have a try, after all, it does nothing harmful to your health. First of all, you should know that you can only use boiled egg to do this. I am not that sure if it can help you with your black eye, but I am very clear that it can relieve your eye pain if you have. In addition, as I have told you, you should use boiled egg to do that, but It definitely mean that you can use a hot egg. That will get your eyes to get hurt easily. You must be very careful with that.