I am about an 8 month user of the Keeper (and recently Mooncup UK). Ever since I've been using the Keeper the bottom of the stem has become dark and puffed out. At first I thought I was just stretching the rubber when I pulled on the stem so it was doing that, or something. But then I got a Mooncup UK and after the FIRST USE there are signs of a little black discoloration on the bottom of the stem.
Am I some freak of nature? Does my hymen squirt darkening dyes? Is this some kind of fungus I shouldn't have in my vagina right now? Am I the only onen with this problem??