The first thing you need to do is to make sure that you have a good idea of what you’re doing. 2. abnormal: if there is a recurrence of anal fistula after surgery, the same can appear in the perianal hard lump situation. This kind of should go to the regular hospital’s anorectal department in time to improve the relevant examination, such as magnetic resonance examination, perianal three-dimensional ultrasound examination, to determine whether there is an anal fistula recurrence. If there is a recurrence, surgical intervention should be carried out in time for surgical operation. Therefore, having a hard lump after anal fistula may or may not be normal and should depend on the specific situation, and it is best to have an experienced surgeon take a look at it.