Take a look at any social media feed, and you'll likely see someone talking about the amazing skincare tool called gua sha. This traditional Chinese medicine practice has become popular with many people-and for good reasons. It promises to increase blood circulation, reduce puffiness, and tighten skin, making it a hit among skincare enthusiasts. However, while gua sha may look simple in a quick TikTok video, there's more to it. The history,...