(( VaginaPagina ))

Sounds like it could be a minor YI to me, especially if you have been on antibiotics (very common cause of YI's) and have possibly been wearing disposable pads for a longer period of time then previous to bebes. That could cause a rash all of its own accord. If you also suspect yeast i'd call your health care provider to see what they have to say about it. I'd imagine taking acidophilus orally would be a breastfeeding/post partum safe option and will help balance out the good bacterias in your vagina/gut if it is in act yeast.