Flo..report the blistering to your stoma nurse or doctor. You may need patch testing. You could be reacting to the components of what the temporary bag is made of or even any wipes you may be using. You wouldn't believe what they put in some of that stuff.
Here's a paper written on all possibilities...which are often overlooked.
www.medscape.com/viewarticle/723146_3
I personally reacted to the bag itself and had to use a stoma powder until i finally got rid of it and my rash cleared up...but no blisters. Oh and i found that i was allergic to the Dial soap they advised to wipe my stoma with after cathing..i did get blisters with that..anything with perfume in it and i break out..so i used some cortisone cream to clear it up and now for 8 yrs have just used plain old water to wipe the stoma after cathing.
But do report it.........
xxoo Pat