Low hair on a woman’s body may be related to genetic factors, but also may be the emergence of diseases, such as seborrheic dermatitis. 1. Genetic factors, if someone in the family has less hair, affected by genetic factors, may lead to sparse hair follicles, and therefore will produce less hair symptoms. 2. seborrheic dermatitis, clinically seborrheic dermatitis, due to the skin oil secretion, pore blockage may affect the normal growth of hair, hair loss may occur after the symptoms of low hair. If there are obvious symptoms of less hair generally do not need to be overly nervous, if the physiological factors lead to, do not have to treat, if the disease needs to be timely medical treatment.