Girls’ leg hair length is mainly controlled by the hormone level, when the girl’s body androgen content is high, leg hair may be longer. Secondly, some girls may be born with longer leg hair than their peers due to genetic factors and increased hormone levels during puberty, but at this time there are no other abnormal signs and generally do not need to be treated. Patients can be treated by oral contraceptives, the use of progestin preparations, etc., and at the same time can adjust the lifestyle to reduce the symptoms; 2, Cushing syndrome: Cushing syndrome is generally caused by the adrenal cortex autonomously secreting excessive glucocorticoids, the patient shows a full-moon face, centripetal obesity, hypertension, etc. The hormone disorder can make the patient’s leg hair grow excessively, generally can use adrenocortical hormone synthesis inhibitors to In general, adrenocorticotropic hormone synthesis inhibitors can be used for treatment. Other endocrine diseases may also cause the growth of leg hair in girls, patients need to go to the hospital in time, for examination and treatment of the cause.