A 10-year-old girl with a moustache may be caused by high androgen levels in the body or hair follicles that are sensitive to androgens. Need to give lower androgen or continue to observe and other treatment and therapy. 1. Excessive secretion of androgens: If a 10-year-old girl has excessive secretion of androgens due to various reasons, such as ovarian tumors, etc., she needs to be treated with androgens or surgically removed according to the situation. 2. Hair follicles sensitive to androgens: 10-year-old girls if the body’s hair follicles sensitive to androgens, it may cause hair growth exuberant, this situation can be temporarily given observation, if necessary, medical treatment. 10-year-old girl has a moustache may also have other reasons, such as precocious puberty, etc., it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, to give targeted treatment or treatment.