Can Growing Foot And Leg Numbness With Pain And Cyanosis Be Treated?

Hello. One week ago, a small area on the side of my left foot and underneath my small toe, on the pad of my foot, became numb. I noticed that the small area was black and blue also. I thought perhaps a spider had been in my shoe and bit me. But each day that has passed since (1 week), an additional area of my foot and leg have become numb. The entire left side of my foot and leg is numb, with only minor pain at times. Thoughts?