Blister in private area?!

KevsLove

Hi all, I apologize for jumping right in with a question but the info I'm coming across online is scarring me. Here's my dilema: A few days ago I noticed a small red sore at the very top of my DD's vagina -right where it starts to split. I put on some all-natural rash cream since we do cloth diapers and it seemed to heal. This morning in the same place was what looked like a water blister!? I put some neosporine on it because it seems to irritate her but I'm at a loss. Any one ever have to deal with this?

Some info:
- DD had no allergies
- We use cloth diapers and disposable liners so I don't think it's irritation from laundry detergent.

Thanks in advance all!