Perianal abscesses can be explored with the help of a probe if the internal opening is not found during surgery or during examination. Or it is also necessary to cooperate with the relevant examination before the operation. Perianal abscess in the process of surgery in order to completely eradicate, first need to identify, the anal canal in the anal canal near the internal mouth, only the internal mouth will be completely dealt with and eradicated, in order to fundamentally remove the root of perianal abscess infection foci, probe the internal mouth generally choose to anal diagnostic examination, with the probe to explore. The more obvious internal opening can be hooked and the direction of the internal opening can be clarified through the probe, so that the internal opening can be further treated. Some of the perianal abscesses are caused by perianal skin infections, there is no internal opening, can be directly incision and drainage can be cured. Patients with perianal abscess can be explored by perianal ultrasound, rectal ultrasound, pelvic nuclear magnetic method before surgery or during examination to further define the size of the abscess cavity and the location of the internal opening.