Day before yesterday I had shooting pains throughout my breast and nipple all day. By that night I had developed a severely painful knot that was very large almost directly on the nipple but slightly to the right on my oriole. I had already had an appointment scheduled for a walnut size mass that has developed under my right armpit but unfortunately there were insurance problems. This morning my knot is still painful and larger and the nipple appears badly bruised. Any ideas why the is??