Labial fusion is a condition in which parts of the vulva, especially the labia minora, stick together instead of separating as they normally would. In some cases, the labia are partially stuck together, while in others, they are almost completely closed. So how is labial fusion diagnosed? The following is the diagnostic method of labia fusion: Diagnosis: (a) History: 1, pay attention to ask the onset of the situation and the development process, has been treated and treatment. 2, there is no trauma or localized injury, and the labia fusion is not a problem. 2, there is no trauma or local use of corrosive drugs history, there is no vulvar spasm, vaginal secretion increase and urination abnormalities. 3, for infants and young children to ask parents about the child’s history of urinary incontinence, urinary stream deviation, crying and restlessness or scratching the vulva with their hands. (b) Physical examination focuses on vulvar examination, observing vulvar development, skin color, clitoral size, and the presence of deformities. (C) Important auxiliary examination for vulvar developmental deformities, chromosome karyotype analysis, sex hormones and 17-keto steroid determination. If there are lesions on the vulva at the same time, biopsy should be carried out to clarify the etiology.