Rash Around Ostomy Bag Site - Treatment Tips?

I’ve had my ostomy bag for a yr and a half and just now I’ve developed a nasty rash. What would you use to treat it with without the bag coming unattached?

It would depend on what is causing the rash. My skin is pretty sensitive and was getting too dry, and slightly irritated under my wafer. I started using "Coloplast Sween Cream." Now my skin looks great! "3M Cavilon Barrier Cream" is another option. They both moisturize the skin but don't interfere with the adhesion of your wafer. Coloplast makes a couple of different types; make sure you get the one that says it doesn't affect tape adhesion.

I had issues with skin irritation, however only under the tape barrier, not the wafer.  I was allergic to the adhesive on the tap portion.  My skin was issues became a yeast infection.  As I couldn't topically resolve the issue without losing adhesion, I took an anti-fungal orally.  I'm a guy, but I basically take Canastan I buy over the counter.  I have switched to wafers without the tape barrier and instead use DuoDerm as a tape (as it has similar adhesive properties to the wafer, but doesn't both my skin and lets me wear my wafer for 6'ish days).

If the skin is sore right around the stoma, for the acids of your stool, I'd start with getting a mouldable wafer so it fits tighter around the stoma.  When I have really iritating sores, I go a step further and I burn/coterize them with silver-nitrate sticks.  I hurts a little, but after an hour it feels way better than the sore that was there before.