Individuals who have scleroderma also could have symptoms of Yet another autoimmune disorder including rheumatoid arthritis, lupus or Sjogren syndrome. Veins have blood back to the guts following the oxygen is taken off. In the event the vein is blocked, blood backs up during the intestines, creating swelling and bleeding. https://www.sgvascularctr.com/treatments-for-gangrene-insights-from-a-vascular-surgeon/