Arteriogram incision healing: concerned about wound care

I am my wife’s caregiver. She has a blood clot in her heart and is being treated with thinners. About a month ago, my wife had an arteriogram. The access to the femoral artery is in the left groin and was closed with a Star Closer. The Closer fell off about four days later. She is obese so belly fat laps over the incision when she stands or sits. We clean the incision with soap and water, as directed by our physician. Here’s the issue. She is immuno-compromised due to high dosage prednisone so we were advised that the incision healing would be slow and should heal from the inside to the surface. We leave it open to air while she lays down and as directed, we put a bandage on when sitting or standing. The incision opening looks to be about a quarter inch deep. It doesn’t look infected but there is pus inside. Oozing stopped about two weeks ago. Our surgeon looked at it a week ago and noted “a little infection”, told us to keep cleaning it with soap and water and avoid antibiotic salve. While the incision surface is not red or hard, the open hole and pus is worrisome. Our surgeon said it could take another month to heal. So, does this sound normal under the immune deficiency and does the belly fat lapping over impede healing? Thank you.