Happy Holidays! Two days ago, I developed a sore spot on my back, just to the left side of my spine. When I felt it, it is very tender to the touch and there is a lump below the skin. It was remained sore and is very red surrounding the area, at least the size of a $2 coin. There is apparently a tiny black spot in the center. It is now increasingly sore, and hurts as I turn or move. Any ideas?