i think i received a nasty spider bite several days age. The area of the skin (calf of leg) is red and spreading. the bite itself started as a small hole with black spots. Now it is the size of a quarter, white in the middle and black around the edges. It is quite painful but the problem is I also have a large lump on the outside area of the calf and the vein (artery) above the knee toward the inside feel lumpy, swollen, and painful. At one point I thought maybe it was shingles. Now I am not sure. Do I have blood poisoning. I do not have a fever. The area is slightly warm and the skin is pink