Gua sha is a traditional Chinese healing technique that involves scraping the skin with a massage tool to improve circulation and promote healing. The positive effects of gua sha include improved circulation, reduced inflammation, and pain relief. The negative effects of gua sha are minimal, but it can cause bruising or skin irritation if done too aggressively. Gua sha tools are typically made of various materials, including obsidian, rose quartz, and bian stone, and can be used with or without skincare products. Some gua sha tools are specifically formulated to work with skincare products to plump, tone, and lift the skin. The ingredients used in these products vary but can include whole plants, minerals, and trace elements.