Girls with long beards may be inherited from their families, or it may be due to disease factors, such as polycystic ovary syndrome, which needs to be treated with estrogen and progesterone to reduce androgens under the guidance of a gynecological endocrinologist. 1. Genetic factors: girls if most of the family members of the body hair is exuberant, it is considered that may be genetic reasons, without special treatment. 2. Disease factors: polycystic ovary syndrome androgen excess, can be manifested as long beard, but also acne, obesity, menstrual irregularities, infertility and other symptoms, need to use estrogen therapy under the guidance of a doctor. Women with beard growth should seek medical attention in a timely manner to clarify the cause and treatment under the guidance of a doctor.