Ok, first, I've never had pyoderma so what I'll be suggesting you what I have seen through time in the literature. Just to make sure, do you know if it is pyoderma gangrenosum, like sores that are ulcers like? If not, well ignore anything I may suggest here as this is what I am referring to.
It's somewhat a auto-immune correlated manifestation. I don't know what medication you are currently on, if any. Many of the anti-tnf used for crohn and UC have shown good results as well on these skin issues. I guess it depends of the severity of the skin condition. Usually it seems they keep one antibiotic and the medication they may use, either topical or systemic seems wide, ranging to specifics antibiotics to some chemo. I know there is a topical tacrolimus cream I don't know if that could be used there considering it's at the stoma site, I suppose your wafer goes on top?
I know that I'Ve seen the indication for pyoderma on my dressing and I know that it is suited for others. Dressing such with Silver in them can be helpful as it prevents infection and keep the wound moist for proper healing, you can see with your doctor if dressing like Mepilex AG or hydrocolloïdal could be suited such as Duoderm CGF.
I don't know if that will of any help but it probably worth knowing about these.
