Hi, I Have Several Health Conditions. Most Recently Developed A

Hi, I have several health conditions. Most recently developed a pain in my middle back that is sore to the touch it extends from just under my armpit on the right side across to my spine and down to just before my lower back. It is exteremely sore to the touch and nothing seems to help it even with being on morphine 3 times a day for chronic pain. What could cause this?