Bulging around the stoma may be caused by a stoma hernia or stoma infection. 1. Stoma hernia: It is usually caused after abdominal surgery, such as bowel and bladder surgery, which sometimes requires a stoma in the abdominal wall. When the contents of the abdominal cavity expand out of the stoma defect, a stoma hernia is formed, which can be manifested as bulging around the stoma, and depending on the severity of the situation, surgical treatment or conservative treatment can be chosen. 2. Stoma infection: after abdominal fistula surgery, if you do not do a good job of cleaning and disinfection of the stoma, and do not clean up the stoma drainage or feces in a timely manner, it will cause stoma infection, stoma ulceration, redness and swelling, and if there is pus, it will bulge around the stoma. In this case, the wound should be cleaned and the pus drained in a timely manner. If bulging around the stoma occurs, you should inform your doctor in time to receive professional treatment.