Chloasma is a common and refractory skin disease,which is a discosmetic dermatosis in which pigment is deposited on the face,cheeks,forehead and other parts due to the pigment metabolism disorder.It is manifested as facial yellow-brown patches,with different shades,different shapes,and often symmetrically distributed.The prevalence rate of chloasma is still increasing year by year,which reflects the physical and mental health of women.Because the cause of disease is unknown,and at present there is no uniform treatment.This paper discusses the etiology of chloasma from modern medicine and traditional Chinese medicine to provide reference for clinical therapy.