Cupping is one of the Chinese traditional medical trement which is good for the blood circulation. The bruisings you can see in this picture are those cupping points. Chinese traditional medical always believes to use the natural way to take care of the human body is the best way and look after the balance of health inside interior of human body is more pratical than take the emergency medical trement when you are already sick.

It looks horrible but it does work for your health
Another guy shows off his bruisings on his back in internet room