noun
gua sha
A traditional Chinese healing technique involving scraping the skin with a smooth-edged tool to improve circulation. Often referred to by its Chinese name in English as well.
カッサは、中国の伝統的な民間療法の一つです。
Gua sha is one of the traditional Chinese folk remedies.
肩こりにカッサを試してみた。
I tried gua sha for my stiff shoulders.
From Chinese 刮痧 (guāshā), literally 'scraping sand'.