History: GuaSha was used on farmers not princesses

According to Ping Zhang, DOM, L.Ac, a N.York–based traditional Chinese medicine (TCM) guru and a pioneering acupuncturist in the field of facial rejuvenation the udea that facial gua sha part of the beauty routine of ancient Chinese princesses is "...false. It’s marketing,”. “Gua sha was originally used for 2 conditions: the abrupt, immediate, sudden collapse of the body from heatstroke and seasonal diseases, like a cold virus" and that it was used since the Yuan Dynasty to revive farmers who had collapsed with exhaustion from working under the hot sun--NOT princesses!