The itchy outer lips may be related to bad habits, or vaginitis, vulvitis and other diseases. 1. bad habits: patients usually do not pay attention to intimate hygiene, easy to lead to secretions and urine residue, breeding bacteria, the appearance of itchy outer lips. 2. Vaginitis: clinically, vaginitis inflammation leads to vaginal lining congestion, edema, increased secretion, secretion discharge stimulation of the outer lips, the appearance of the outer lips itchy situation. 3. Vulvovaginitis: patients with vulvovaginitis after the invasion of bacterial viruses or other pathogens, may lead to increased secretions, not timely cleanup may be very itchy external lips. Itchy external lips, it is recommended to consult a doctor in a timely manner, after a clear diagnosis before treatment.