Hi Dess,
My stoma "burns" as you describe where I had granulomas that I removed with Silver Nitrate. Although the granulomas are gone that section of my stoma stings pretty good most of the time. I'm not sure it's related to acidic output, but more to the condition of the skin specific to that area. Not sure what your bowel situation is, or how much is still intact, but with my small bowel only being about 4' long.........what comes out is always acidic in nature due to the bile produced and stomach acid not reabsorbed. Normal pH for someone with complete small and large intestine is 6.6, with the "normal range" being 6.1-7.9.....so always on the acidic side of things. You can check yours simply enough...........just get some pH strips (the ones for the pool are cheap) and check.
If it ends up being at the high range or over, you may have an issue with bile malabsorption.........and they can check for that. If your pH is too low or on the basic side of things you could have bacterial overgrowth.......but that's not really what we're talking about here. Get with a good Gastro and they should be able to tell pretty quickly if you have an acidity related issue or a stoma skin issue. From what I've found there are no real "stoma experts", as it seems to fall between the specialties of Gastro and Colorectal Surgery........so neither seems be very knowledgeable on the specific stoma itself. But maybe you're experience will be better.
I put topical Betamethasone on the area of my stoma that stings. It burns going on, but provides relief for a few hours. If I were you I'd wait to talk to a good Doc before trying to treat it. If it's any consolation............you do get used to the pain after a while, and it's just another "new normal".
regards,
bob