This happened to both of my daughters...my oldest when she was about 12 months old (she's now almost five) and my youngest (now ten months old) a few months ago. Both times we ended up using the estrogen cream, because the adhesion was severe enough that it made urinating difficult for them. Within a week of using the cream, they returned to normal. I would say that, if it isn't too bad, you could get away with not using the cream and just keep her clean and dry. Also, try applying something to protect the area from moisture (I like Lansinoh lanolin because it's gentle and totally natural). However, if it looks pretty closed up, I'd consider using the estrogen cream until it improves a little. If her urine is pooling down there it could easily turn into a bladder infection. As far as it reoccuring, I think that's mostly a possiblity while they're still in diapers. It's harder to keep the area clean and dry, so they end up with irritation. I had to keep an eye on my oldest while she was in diapers, but ever since she was potty-trained it hasn't been an issue.