I had an "inverted" stoma. Even had corrective surgery, just on the stoma, and it didn't help.
The surgery made my stoma size a 19 but by the next measurement, it was down to 9. Smaller than before. That's because being oval-shaped, the sides were always moist so my body constantly tried to "heal" it. Then I'd pass a stool and it stretched it some and caused a little bleeding sometimes.
Due to the spaces between the bag and skin, I more often than not had pancaking. No matter what, my skin was always in contact with something that created raw oozing skin. I sometimes had to change bags 3 times a day. I'm allergic to adhesives so I was always irritated and bags always leaked.
I tried rings but I ended up tearing them into pieces to use to make a flat surface. I tried a ring that was shaped like an eye but that didn't help. I tried to stretch it but it returned to its original shape. I got some strips shaped like a "c" that affixed to the outside and it helped sometimes. I got an adhesive 4x4 pad that I had to cut a hole in the middle shaped like my stoma and affix it to my skin but that leaked too.
I ended up getting reversed a lot sooner than I expected. By then, I was crystallizing the stoma powder (repeated applications of powder and skin barrier (I bought the spray kind)) to try to protect the skin.
In hindsight and since I still have problems with getting backed up, I won't be surprised if I have another ostomy. I was going to learn about irrigating. I'm told you control the timing of your movements so you're prepared when it happens. I don't know the particulars about it at this time. I'm not looking forward to it, but I just can't seem to get regulated and I still have painful explosive diarrhea. The preventive stool softeners and Miralax make me too loose. I'm trying manuka honey and aloe vera drink right now. If that doesn't work, next I'm going to get probiotics. Anything I can find to regulate my stomach. I feel like I live in the bathroom and too many conversations are focused on poop in my opinion. I'm 60 lbs overweight, maybe I'll quit eating for a long while. Who knows?
I also used a belt; the hooks are already on most ostomy bags. It pulls the bags tighter to your stomach; it was a great find.
Good luck, Charlotte