What is the best treatment for chronic trigger points in the upper back and shoulders?

It depends: It depends on the cause. Is it fibromyalgia or a more local issue?

Several: 21 yo male with chronic tender points upper back & neck might have fibromyalgia. Treatments might include myofascial trigger point injections, acupuncture and massage. Keep muscles toned by exercising in warm water, where water buoyancy negates gravity. Some people swear by topical lotion made from cannabis extracts. See an Osteopath.