A week ago I started to experience a dull ache in my left shoulder blade that at times felt like it was coming through to the front of my chest. Two days ago I developed a raised skin rash in this area that has now grown to approx 12 raised sores that are very sore and itchy and it has started to spread. There are no open or weeping sores just raised knobbly areas. Any ideas or treatment that you can advise would be greatly appreciated. I am female and 59yrs of age .