A small bag on the incision may be related to incision infection, proliferative scarring, incisional hernia and other causes. 1. Incision infection: when the incision is infected, it can lead to localized pus and a small abscess bag. 2. Proliferative scar: If the wound has healed to produce a scar, if the scar protrudes from the surface of the skin, manifested as a small bag. 3. Incisional hernia: If a hernia occurs at an incision in the anterior abdominal wall after abdominal surgery, it can cause a small bag to appear on the incision. It is recommended that the person who has a small bag on the incision go to the regular hospital in time, to clarify the cause of the disease, if treatment is needed, under the guidance of the doctor for standardized treatment, so as not to delay the condition.