Tennis Elbow

I am assuming you are a bodyworker and not an acupuncturist, so one answer would be to refer to an acupuncturist as that can be extremely helpful. On your own, the trick generally with these conditions is to not overly focus on the area of pain but from the cause of the pain. The cause, outside of acute trauma to the bone itself is generally from a mix of tight or misaligned neck and/or shoulders and tight tendons running into the wrist and forearm. So if you focus higher up on the neck and shoulder and then try to lengthen the tendons in mid forearm and wrist you should do well. Patches, etc. locally will generally only help temporarily. From an acupuncturist, cupping on the shoulder and scapula are on the affected side can be very useful.