Bleeding and Smelly Discharge from Belly Button

My husband is a very fit 44 year old, who -- for the past couple of months -- has had a bloody, smelly discharge oozing from his belly button, without pain.  His internist says it is a tear in the abdomnial wall and that it's abdominal fluid leaking out.  For treatment, he has my husband filling up his belly button with a paste made of sugar and water, supposedly to dry out the belly button and cause it to heal.  If that doesn't work, he says he will sew up the tear.  Does this diagnosis and treatment sound proper?  It seems crazy to me!