Today, Michael Phelps wins 200-meter butterfly for his 20th Olympic gold medal ! He really accomplished a big feat. But have you noticed Michael Philips’ shoulder? Those dark red spots are mysterious to the audiences. You might imagine that he was attacked by someone, or cigar burns and perfectly circular hickeys. It’s impossible. Actually, it is an ancient therapy-- Cupping Therapy that have mostly been used in Middle Eastern and Asian countries, especially China. Competitors will give anything a shot to get the advantage over their rivals whether it’s a new diet， a different stretching routine or suction cups。The therapy consists of having round glass suction cups that are heated and applied to parts of the body。 The temperature of glass creates suction that supposedly helps treat pain and relieve muscles of knots and swelling。 It's not the first time cupping has made the rounds. Celebrities like Jennifer Aniston, Gwyneth Paltrow and Jessica Simpson have all been spotted with the marks in previous years. Cupping is not new, it's ancient.The practice of cupping has been mentioned in ancient Greek and Egyptian texts. In recent years, cupping therapy has been used for people suffering all sorts of ailments including shingles, facial paralysis, cough and difficulty breathing and acne. But cupping is most commonly used to treat pain, according to the analysis. Latest Popularity:Michael Phelps' Face Was Tricked Over Twitter