Do gua sha tools actually work?

Across specialist skincare subreddits like r/SkincareAddiction and r/30PlusSkinCare, the consensus is that gua sha helps with facial relaxation, lymphatic drainage, puffiness reduction, and product penetration. Reviewers consistently caution that claims about wrinkle removal or permanent facial lifting are not well supported by research, the benefit is real but modest and mostly tied to consistent facial massage.