Hard lumps and bulges after inguinal hernia surgery may be related to infection, patch rejection, and edema. 1. Infection: lumps and bulges after hernia surgery may be related to infection. Hard lumps or bulges can occur due to fluid retention, infection, and hematoma in the incision, resulting in adhesions and scar tissue formation. 2. Patch rejection: hard lumps and bulging bags after surgery may be due to hernia repair, the patch is an exogenous foreign body, the tissue and the patch does not have compatibility, the patient will have a foreign body sensation in the abdomen, if abdominal pain, fever, etc., you should seek medical attention in a timely manner. 3. Edema: after hernia surgery, the surgical area may have fluid accumulation, tissue edema, manifested as hard lumps, bulging, etc., you can carry out local hot compresses to reduce the symptoms. If the symptoms of hard lumps and bulging bags are not relieved after the operation, you should consult a doctor in time to find out the cause of the disease and treat the symptoms.