pea sized/shaped lump on vagina

I just noticed it now, not sure how long it's been there, it's not painful or anything but it's under the skin, you can't see it's there but you can definitely feel it. Should I be worried?
Note I usually get these types of lumps on the inside of my thighs (when they rub against each other) but I've never had anything like this anywhere else on my body so I'm a little concerned. Does anyone know what this could be?