Once again, we saw these circle marks on the Olympic athletes. They are marks from cupping, https://acupuncturechinamedical.com/therapie/cupping-%e6%8b%94%e7%bd%90/
Treated a 10 years old boy with sprained feet. Left needles on for 10 minutes with elevated legs. He felt 30% less in pain and the swelling got reduced after the first session. After the second session next day, he felt 60% less in pain. He felt 85% better after the third treatment.