Yes, I'm sure of what it was. I think that when you have this and do as much research as we do, you definitely know.
I looked up where I saw the info about fungal infection due to candida and one place was healthcaremagic.com and another was dermnetnz.org
I'm a big believer that is something is wrong on the outside, then something is wrong on the inside. You have to figure out what's going on inside your body first. Since I just took a round of Antibiotics (which can cause yeast overgrowth) topped off with several days worth of sugary and starchy food (which can, too), I went with the belief that it was a yeast issue.
You'll see on some of the posts on healthcaremagic that some doctors do recommend an anti-fungal. So I'd say it's safe. You don't put it in your mouth, so it's like putting it on any other part.