I draw your attention to the woman's shoulders in the photo below.  She's a staffer at USTC in Hefei, and it may appear she's been attacked by some Star Trekish creature with tentacles and suction cups. But no, this is part of Chinese medicine. In almost any massage business, there's a technique called "cupping." It's unclear to me what it's supposed to accomplish, but in one form of it, hot cups are placed on body parts, which leave very red welts for days. In the case below, it was suction cupping, in which, just as it sounds, large hickies were left on her back.