Cupping (or myofascial decompression) uses glass suction cups that stick to your body because of a vacuum inside of the cup. The cup sucks in and resets your body’s tissue (skin, fascia, muscles, nerves, veins, and arteries), breaks up adhesions, and the relief is often immediate. This treatment became very popular at the last Olympics in Brazil.
From an Eastern Medicine perspective, the cups are sucking out stagnation and dampness from your body, and increasing circulation to help your body heal more quickly.
Cupping may leave circular bruises on your skin (like hickies) that go away after a few days. It’s also become very popular in Beverly Hills, where Hollywood starlets are often photographed leaving their acupuncturist’s office with purple circles on their shoulders/back.