Pemphigus vulgaris is a relatively common skin and mucous membrane disease of hair loss in the clinic. In the clinic, there are many kinds of identification methods, and in fact, from ancient times, there are a lot of medical doctors have already made certain exposition on it, such as the liver stores blood, hair is the rest of the blood, the kidney stores essence, the liver and the kidney are the same source of its China in the hair, and so on. There are also medical doctors who have put forward like stomach qi deficiency, no source of qi and blood biochemistry, and so on. Overall, the identification of spot baldness in Chinese medicine can be divided into spleen and stomach weakness, liver and kidney deficiency. Some patients may show deficiency of qi and blood; some may show obvious symptoms of liver qi stagnation. Other patients may show stagnation of qi and blood stasis, or may have various conditions such as wind and evil obstruction of collaterals.