How does the skin in that area feel - itchy, sensitive, etc.? If it's not bothering you and if you are getting a good seal with the wafer, I would give it a couple of changings -- a chance to heal if that is what is going on. Then I would try to clean it off.
The Eakin Seals will also leave a film or thin layer of paste-like substance right around the stoma where the wafer has begun to break down. It does take a little light scraping to remove it all when I change BUT my skin is fine under it. In your case, you started with an irritation around the stoma and you don't want to irritate it any more.
Diagnosed with CD in 1979, many resections and meds
Perm Ileostomy July 1984 at Cleveland Clinic
Disease free since surgery