pilonidal sinus excision (Left open to heal)

Hello, I have had this exact procedure twice, roughly 6 years apart, and roughly the same dimensions as you indicate. I found that it just takes time to heal. I changed (actually my wife changed) the dressing far more than once per day, more like 3-4 times per day and used a saline rinse each time. There was some blood initially but it quickly diminished. It did not hurt but felt odd (cold!) with the saline solution. It healed fairly well after about 4 days. I did not go to the gym or run at all during the healing process. I found this procedure to be largely uneventful but was very thankful to my wife for assisting. Pilonidals can come back. I am an example. I have learned that if I have any sense of a return I go to the colorectal surgeon and have it addressed immediately. Waiting does not solve the problem, nor do antibiotics in the long term. Good luck !