An incisional hernia is a swelling that pushes through a previous scar from whatever kind of surgery your child may have had.
This can be due to poor healing at the time, failure of the stitches to close the muscle, infection, or a blood clot after the operation (hematoma). These include an obvious swelling, which may be tender when the area is touched. Treatment usually involves repairing the scar and making sure the muscles are stitched together to prevent a further hernia. This can be carried out with open or keyhole surgery.