comitoex~welcome to the forum! This is a great place for help
I did want to mention that there is an ostomy forum and there are a few active threads regarding skin issues very similar to yours. There are many options but it does sound like you might have either an allergy to the components of the wafer or possibly a yeast infection? Please check out the threads to get some ideas that might solve your problems.
Do you have a WOC/ET nurse you can see? If you don't have one that you see you can find one in your area at their website: www.wocn.org
Best wishes I hope you find relief soon!