Rub backwards and forwards in excess of the tendon (across it) gently with all your thumb or finger pads until the sensitivity fades, which should really consider not more than a minute or two, and after that improve the depth somewhat and repeat. Rotator Cuff Tendinitis: Also called impingement syndrome, https://www.theorthopaedicandpainpractice.com/why-do-my-outer-elbows-hurt/