Hair loss and dandruff are relatively common problems in dermatology, in clinical practice, seborrheic alopecia, also known as androgenic alopecia, combined with seborrheic dermatitis, the causes of which are mainly considered to be related to the following factors: 1. Genetic factors: especially seborrheic alopecia and genetic factors are very much related, the vast majority of patients have a family history. 2. Hormone levels in the body: especially androgen levels, androgens in the body The hair may shed more under the action of androgens. 3, androgenic effect: the secretion of a large amount of sebum by the sebaceous glands of the hair follicles will lead to a greasy scalp, and this environment is suitable for the presence of superficial dermatophytes such as Malassezia furfur, which will therefore lead to more dandruff.