@Purplechrain, sorry about the developing allergy you are seeing 
Tegaderm is a type of solid adhesive tape, that you can buy on Amazon. Mastisol is a liquid adhesive that you can also buy there, similar to SkinTac. These liquid adhesives can serve as an isolating layer.
@Chris gave you some great info and links—check them and the wiki! You have many, many things to try there. The ultimate step, as you will read, but also the most inconvenient, is to introduce a thick colloidal layer under the patch. But you have many steps you can take that may resolve your issues!
Let us know how what steps work for you!