Massage cupping therapy is a form of alternative medicine where silicone cups are placed on the skin to create vacuum suction for increased blood flow, reduced inflammation, and improved lymphatic drainage. It works with negative pressure but gives the same results as (and added benefits of) deep tissue massage.
I use these cups during treatment but also at home as part of my self care regimen under the shower. They are GREAT for scar work, too.
They are available from different manufacturers, just make sure you choose silicone (not glass) cups so you can squeeze them nicely and get some good suction going.