Can feel the fistula is not necessarily subcutaneous fistula, because subcutaneous fistula is mainly in the subcutaneous tissue of the skin, usually connected to the entrance and exit, the middle tunnel is under the skin, if the fistula is to the deep muscle or fascia towards the direction of the fistula is not subcutaneous fistula. It is usually difficult to determine by touch, but can be determined by fistulography, that is, injecting a contrast medium into the entrance of the fistula, and then taking X-rays to observe the direction of the fistula, to be able to fully clarify whether it is a subcutaneous fistula or another fistula. Whatever the case of fistula must be formal treatment, preferably through surgery.