What Could A Nodule On Labia Be?

my boyfriend and I were messing around and he found a "nodule" for lack of a better word, on my labia... and it is clear/white in appearnce... no odor... no pain..no itching, no irritation, no discharge.



when I press on this nodule it just goes back it does not hurt at all... what could this be... obviously not herpes.