Dear Doctor, At about 9 o clock last night, i noticed a bruise had suddenly appeared on the inside of my left wrist; right on top of one of the arteries. I don t remember hitting anything, and it is more purple and bigger, and has my-normal-skin-colored dot in the center of it. Today, my left hand seems to be cold, and it keeps cramping up. My grandmother, my mom, and her sisters all had problems with low blood pressure. (if that helps anything) Thank you, Jenny