Hi ariesbaby. This sounds annoying! Weird question . . . but depending on where you live , is it summer? Wearing shorts and sitting in grass or anything like that? I had . . . a mosquito bite in that area. Oh my gosh, so itchy and annoying. It happens. And I wasn't outside naked, I'm a mom type so do things like water my plants outside at night or go to the park with kids. Still, it happened. So, just a thought.
I will tell you that inflammation on the labia from a sore can turn into a bump. And as anniebrooke mentioned it could definitely be a cyst. It itches? But still could be. Here's an older medhelp thread with a doctor https://www.medhelp.org/posts/Womens-Health/hard-bump-under-skin-on-labia-majora-What-is-it-should-I-be-concerned/show/1702034 The
doctor says it could be a cyst in that thread.
Quick question though. Sorry to ask, but are you sexually active? We're sure this isn't a herpes sore?