Hello~You need to see your gyn, it could be a type of herpes, but you need to have some tests run to find out what type and if indeed that is what is causing the issue.
I well it's possible u may have...herpes. If that's what it is don't be like omg that's wrong or think no i don't, because the version of herpes known as cancer sores around the mouth can randomly occur down there even if uv never had a cancer sore before. ..i never did but the tests proved it was that strain. It happens