If one inner lip is longer, thicker, or larger than the other, it's considered asymmetrical. It's actually quite common for vulvas to have labia minora.
“Where would you normally see another vulva? In short: I'd have to confront the big stuff.” . I thought my labia were too big as well. I had to.
Thanks to porn films showing generally hairless women with 'perfect' rosebud labia, both men and women alike have adopted an expectation.