GVHD is a common complication following a bone marrow transplant from another donor. GVHD occurs after transplant when the donor's blood cells recognize parts of the body as foreign. During this process, chemicals called cytokines are released that may damage certain body tissues, including the gut, liver and skin. Some of the main effects can include red skin rash, diarrhea, sometimes with blood, and yellow jaundice. It can range from mild to life threatening and often requires admission to the hospital for treatment. The standard treatment for acute GVHD is a combination of steroids and another drug that suppress the immune system, such as tacrolimus or cyclosporine.