Myofascial pain trigger points come up regularly not only in clients but in my own body. The simple video below shows you how to work on a muscle called subclavius. I find many women with large breasts have problems with the area as well as people with severely rolled forward shoulders that cause a slouched posture.
You can hold pressure on the spot that causes referred pain down the arm. Hold until the referred pain subsides or your hands grow tired. Rome wasn’t built in a day, take your time. Play with the muscle, angle and move the clavicle around to find the sweet spot. Self care for trigger points is highly effective.