Labial adhesion in prepubertal girls is a common gynecologic problems. The labia minora are fused by thin transparent or thick fibrous membrane in the midline from the clitoris to posterior fourchet. The prevalence of labial adhesion may be even greater because many children with labial fusions are asymptomatic and these cases remain unreported. They are often unrecognized by physician and parents because most of symptomatic children complained urinary symptoms. The authors experienced 2 cases of labial adhesion in girls; one asymptomatic partial fusion and the other symptomatic complete fusion. These lesions were treated successfully by mechanical separation of labial adhesion and petroleum ointment (Vaseline) application without recurrence in follow-ups.