Hej! Hoppas du mår bättre nu? Hi. Hope you're feeling better now?
Have you considered that you may have an allergic reaction to either latex, copper or zinc? Also, do you know what Hydradentitis is? You can do a search on the Internet and read about it. It's a condition whereby the sweat glands can get infected and it's possible to get this on your sack!!!!! If you have this, and it's not all that rare, perhaps your ROP is encouraging it?
By the way, where did you buy your copper and zinc in Sweden? Zinc seems to be really hard to find here in Skåne!
Good luck with your "noble prize" anyway (Swedish joke...)