Labia minora adhesions are the two inner labia minora adhering to each other at the midline. There is usually a small hole between the front of the adherent labia minora and the underside of the clitoris, through which urine can drain. There are different opinions on whether labia minora adhesions are congenital abnormalities or acquired diseases. Some believe it is due to local inflammation and estrogen deficiency, or as a result of labial fold variation and urogenital sinus underdevelopment. Most scholars currently agree with the former opinion. The child often has no difficulty in urination, but the urine line often shoots upward, drawing the mother’s attention and revealing an abnormality in the vulva, which has been mistaken for vaginal agenesis or is suspicious of gender. Local examination reveals a thin, smooth and slightly red-blue film on the midline of the labia minora, with a small hole below the clitoris. Sometimes a small amount of urine remains near the vaginal opening and causes a pseudo-urinary tract infection, which can locally induce vaginal labyrinthitis. Labia minora adhesions usually occur in infancy and early childhood, but are rare in children and do not occur in newborns due to the influence of maternal estrogen. The treatment can be done without anesthesia by expanding the balloon catheter and separating the adhesions in 2 minutes without pain or bleeding. There is no damage to the external genitalia and it is safe. Postoperative erythromycin ointment is applied for 7 days. The results are satisfactory. In recent years, we have been treating children in outpatient clinics, and we have received satisfactory results in clinical observation every three months.