The difference between bruising and embolism is mainly in the temperature of the skin and the change of the skin surface. If bruising occurs, the temperature of the skin will not show a decrease in the change, and even a slight increase, and there will not be any other skin symptom except for the change of the color of the skin to bruise. If embolism occurs, first of all, the temperature of the skin will decrease, and the skin will appear maculopapular symptoms, local bruising will also occur, but the color is not uniform, varying shades, and the color will gradually worsen with time, and the surface of the pus blisters will break out, and the skin will appear necrosis.