Researchers have carried out small studies on the following groups of people to see if gua sha works:

Nielsen A, et al. (2007). The effect of gua shatreatment on the microcirculation of surface tissue: A pilot study in healthysubjects [Abstract]. DOI:

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Decreases inflammation: Science has found that gua sha can help temporarily relieve pain and tightness in certain parts of the body—even leading to results that last. Those studies suggest that gua sha has an impact on inflammation (which often leads to pain). Generally, you'll want to avoid low-quality stones that may break and harm your skin,” says Caroline. “Stones that have a rough or uneven surface that may also cause irritation.” Which brand of gua sha stone is best?

Gua sha is the practice of using a tool to apply pressure and scrape the skin to relieve pain and tension. This action causes light bruising, which often appears as purple or red spots known as petechiae or sha. Nielsen A, et al. (2014). Addendum: Safetystandards for Gua sha(press-stroking) and Ba guan(cupping) [Abstract]. DOI:Attempts to fully decipher the language of the Hilichurls have been made using a combination of sources including the official manga (Part 4 Chapter 5), Hilichurl Ballad Selection, Hilichurl Cultural Customs, and the quests involving Ella Musk. Hilichurlian is transcribed using human languages both in Genshin Impact and in real life; it is unknown if hilichurls have their own writing system for Hilichurlian.