Why Is The Right Side Of Labia Minora Swollen?

I'm 16 and having some issues "down there". The right side of my labia minora is alot bigger than my left. It also has another fold of skin coming from the middle of my right labia minora, like extra skin. My left labia minora is barely even there. Sometimes the right side will swell up randomly, which causes even more discomfort than I usually have. I have gained a significant amount of weight within the past year, and was wondering if that is what caused it to elongate? It was not always like this, and it started within the past year, but my left labia doesn't get bigger at all. Before this year, it was very small and even on both sides. Does anyone know why this happened?