If one Chinese athlete had turned purple like that-the ensuing firestorm of doping ,drug abuse would be overwhelming.As I thought vasodilation exteme like some people turning beet red when drinking alcohol(booze flush/blush)As one poster here said about lactic acid buildup-couldn't agree as LA buildup causes soreness,fatigue etc and is flushed out quickly within a few minutes by respiration/circulatory cycle moreso if you are fit/strong-not hours.Consulted a pharmacist friend and he replied."what the hell are they taking?"
Pan Zhanle, the purple people eater.