I am allergic to PI myself and have had bad cases of it to the point that my eyes swelled shut. I use the cordizone blister pack but I also use spray starch on it. It will seal the area sprayed, it contains corn starch to help dry it up, it is clear so it does not look bad on you. I have recommended this for years. I got my worst case by walking thru smoke and the last time I was picking blackberries for Mom to make a pie. I don't go near the stuff anymore if I can help it. Just reading this made me itchy all over. I sure hope you feel better soon. Wash and change clothes and linens often. Try that spray starch on an area!