Yesterday I noticed a single, small blister on my labia minora. There's no itching or pain (unless I put pressure on the blister), I have no swollen glands, fever, or anything like that. I haven't had any sexual contact for a month, I always use protection, and I've never had any herpes symptoms before. Additionally, a couple of days ago I spent the day biking in bike shorts and afterwards felt a little uncomfortable in the groin area. I'm wondering if my blister is simply due to friction or if it could be herpes. Thanks for your help.