Fistula
Fistula (English: Fistula, or fistula) is the surface of the epithelial cells and visceral or deep tissue between the formation of pathological channels, with mouth and outside the mouth. Fistula outside the mouth, also known as the drain, is the flow of pus, dripping constantly, can not shut mouth ulcers sores. And sometimes, in order to achieve the purpose of a disease treatment, but also through the surgical method to create a fistula. ...