Blood Stasis Jaundice

Didang Tang consists of 4 herbs that all break up blood stasis and eliminate accumulations. Very clearly, the line implicates blood stasis as the cause of Didang Tang jaundice.  Modern TCM doctors also acknowledge blood stasis as a cause of jaundice in the body.  My question is, why do people turn yellow when afflicted with blood stasis (at least this type of blood stasis)?  I'm trying my best to link stasis to the earth organs and am having great difficulty.  Is it also true that heat can cause jaundice by itself (in addition to red complexion)?  Help!