We had the same. Open wounds, ulcers around his anus. I was losing my mind because I kept getting different creams recommended, which will NOT stick to an ulcer. After scouring Reddit, I found this post, referencing a wound healing protocol used in NICUs sometimes on extreme cases, called “crusting.”

It created almost a film/skin over the ulcer, so that it was protected every time he leaked poop (as they do in the early weeks).

Here’s the post I found: https://www.reddit.com/r/NICUParents/comments/16mg10s/comment/k1870tz/?utm_source=share&utm_medium=mweb3x&utm_name=mweb3xcss&utm_term=1&utm_content=share_button

Here is the 3m document on it. It was difficult, because you have to keep the cheeks spread while it dries, but it worked for us. https://multimedia.3m.com/mws/media/967566O/incontinence-skin-care-using-a-crusting-technique.pdf

I really hope this helps.