Occasionally I have very mild swelling of my labia, followed by soreness, and itchiness of the area. This happens every so often. I have not been sexually active in the last three weeks, and do not have discharge that is unusual. This comes at times where I am doing nothing different than my usual routine. The itchiness and soreness of my labia makes it difficult to sleep. Usually this persists about a week and then goes away. The soreness/itchiness is bearable, but I just want to know what causes it. Any thoughts?