Yellowish green or greenish brown skin is most often caused by jaundice, which is a sign and symptom of yellowing of the skin, sclera and mucous membranes due to elevated bilirubin in the serum. The following is a description of how the disease is diagnosed. The first step is to determine whether jaundice is present. Yellowing of the skin and mucous membranes does not necessarily mean jaundice, which may be caused by the intake of large amounts of carotenoid foods or certain medications. The skin mucous membranes are not yellow, not necessarily without jaundice (invisible jaundice), when total serum bilirubin > 17.1 μmol/L, but L, not easily detectable to the naked eye, is also called subclinical jaundice. The presence or absence of jaundice is determined by the amount of total serum bilirubin, and any serum bilirubin >17.1 μmol/L is considered jaundice. Second, to clarify what type of jaundice is present, the classification of jaundice is hemolytic, hepatocellular, cholestatic, and congenital nonhemolytic jaundice. In hemolytic jaundice, there are signs of anemia, reticulocytosis, predominantly increased unconjugated bilirubin, urinary bilirubin (+), urinary bilirubin (-), and marked hyperplasia of the red lineage in the bone marrow, according to which the diagnosis is made.