(( VaginaPagina ))

Sounds like it could definitely be a YI. If you're unsure, I'd head to the doc in a day or two (or sooner if the itching gets really unbearable) to make sure. Typical symptoms of YIs are itching and clumpy white discharge, but not all YIs have one or even both of those symptoms! I've noticed (and sorry if this is a little TMI) that when I let a YI get really far along before treating it, when I look at myself with a mirror, I can see white stuff almost coating what I can see of my vagina.