I have a pretty rare but nasty condition, for which i will get surgery at the Mayo in Jacksonville by the end of the month. My labia minora did fuse, and closed my vulva up and is covering the urethra exit, forcing the urine to run down into the vagina and exciting from it. This causes constant irritation and inflammation, and is very painful. Once the labia is separated again I am supposed to put estrogen cream on it to prevent any future fusion.
This fusion thing can happen to post menopausal women who are not sexually active. The labia does not get enough estradiol containing blood supply in those cases, and tends to fuse . The estrogen cream is supposed to make sure it cannot happen again.