could be a yeast infection.. IF it is.. drinks tons of water to help clear it up. Additionally, I find Capryl Acid in supplement form really does the trick for me, it gets in there and kills off the yeast. However, when taking it, the water is essential because you want to cleanse your body of that which the CA is breaking down..
Also.... Yeast Infection is one thing.. but swelling too.. while that can happen, I would that if it keeps up for too long, perhaps going to the docs...
Epsom Salts might work for the swelling but if it's a Yeast Infection, the problem started on the inside.. also, when too much sugar, white flour products and or cured foods are eaten, the yeast LOVE that and it causes them to grow... this also includes things like vinegar, peanut butter (often you can't see the invisible mold growing on it) but yeast love anything that helps them grow.. view yeast as a fungus and you can see why they would love certain foods.. also.. and you prob know this.. cotton underwear... those synthetic ones wreak havoc on the privates.. esp if you are prone to yeast infections..
best of luck