Seborrheic dermatitis often occurs on the skin where has rich sebaceous glands.It is a chronic and inflammatory skin disease and its symptoms include scales,scurf,pruritus,flushing or erythema.Morbidity of Seborrheic Dermatitis is 3% for general people.Malassezia is the main nosogenesis for Seborrheic dermatitis although the reason has not been explained completely.Therefore,this thesis will discuss the relationship of malassezia furfur and seborrheic dermatitis.Furthermore,we will come up with a new point after thinking about trade off for treating seborrheic dermatitis resulting from malassezia furfur.