Normally, a person's skin may be yellow due to his race. However, there are also hundreds of medical conditions which are possible causes of yellow skin. Anemia is one of them. Bruises can also cause the surrounding skin area to turn yellow, which is usually a normal part of one's recovery. Other more serious cases are jaundice, uremia, alcoholic liver disease, cirrhosis and many others. You can view the complete list and details through this link: http://www.rightdiagnosis.com/symptoms/yellow_skin/causes.htm.