It is ok for you to get the shower with the black eye if there is no scratch on the eyes surrounding parts. However, the hot water will increase your blood circulation which will do benefits for the healing process of your black eyes. You should just take care that not using the hands to rub the eyes. And you should eat vegetables which contain the large amount of vitamin C to make the black eyes get cured quickly.
Frankly, it will depend on the situation of your black eyes. On one hand, if you just have the black eyes, and there is no broken skin, and why not take a shower when you want. Just go ahead if you like. While taking the shower, just remember to be careful enough in case you will hurt the black eyes. On the other hand, if you find some broken skins or cuts around the black eyes, I think you had better not. Because you know you will let the water flow through our full body and if the water flow onto the cuts, then it is very easily to get infected and then the black eyes will get worse, also it will be more painful. Because of the fact, you just can take a shower on condition that your black eyes are recovered. Pls no worries, it will not take too long, and it will take about one week. Apart from taking shower, when you are doing some other things, you also should be careful.
Of course, you can take a shower even if you have black eyes. First, you should know how the black eye occurs. Generally speaking, when blood and other fluids collect in the space around the eye, it is possible to have a black eye. And in most cases, it is often caused by the injury to the face or the head. Then swelling and dark discoloration can appear. So just take care of your head or face, so that it can not lead to black eyes. To treat a black eye, you can try using ice to reduce the swelling caused by a black eye for the bruising will start fading in this way. But you also should pay attention to the irritants when you have shower so that it can be infected.