Hi there. I have a little hard thing on the inside of my labia. It's white in color but I have had it since I was pregnant with my 7 y/o son. The gyno told me it was a skin tag caused by messed up Ph from my hormones. I don't know if this helps you. But I would definately get it checked out by a gyno. It could be te Ph in your body or the herpes virus (which is highly treatable and non fatal)