Cupping releases accumulation of lactic acid created by stress from the fascia the layer above the muscles.  Some massage therapists, acupuncturists and other CAM (Complimentary Alternative Medicine) practitioners provide this service.  

You can even buy your own kit if you need fascia release which contributes to pain.   You can check out you-tube… don’t leave the cups on longer than 5-10 minutes. Expect dark purple circles to the treated area after treatment, this is normal.