@mpersonne

Try to keep it dry and bandaged with real sterile gauze (not band-aid) and protected from rubbing on anything (underwear elastic or similar). After the shower gently dry it with hair-dryer (low heat) and re-bandage. If that does not help in couple of days ask if they can use some bio-glue to close it. If you notice any yellowish or thick discharge go to doctor immediately.

My husband's incisions healed very fast, but I remember reading here that side drain sometimes needs couple of days longer to close. Just keep your eye on it - it should be getting better , even if it is little by little. If there is no change definitely ask your doctor for advice.