One thing that I have recently discovered that seems to be helping the healing involves two simple things. A 2 by 2 (which is a gauze pad that goes around the catheter to protect the catheter exit site) and sterile water with salt (the water was provided by the hospital and I just added regular table salt).
Simply soak the 2 by 2 in the salt water and place it around the exit site and allow to sit there for 10 minutes or so once a day. His site looks better and better each time we do this. Remember I'm not a medical professional, so before doing anything different, please talk to your dialysis nurse or doctor.
*Disclaimer - all the information above is for information purposes only. I am not a nurse, doctor, or any type of medical professional. I'm a wife taking one day at a time while taking care of a husband with PKD