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.