Your problem is lubrication. Make sure your well lubricated and you'll be fine love! Skin releases chemicals called histamines/cytokines when its traumatised. So you need to minimise the friction/ trauma to the skin
Hi,
Vulvitis is an inflammation of the vulva (the visible external genitalia). Vulvitis is not a condition or disease; it is a symptom that results from a number of different causes including allergies, infections, injuries, and other external irritants.
In your case it could be an injury caused by force or it could be a reaction to condom/gel used during sexual intercourse.
The most common symptoms are itching, redness and swelling of the skin folds. Sinse your complaints don't include itching and redness, this would lean more towards an injury caused during sex.
You can apply a cod pack to reduce the swelling. Also take an anti-histamine if you develop itching/burning sensations.
If swelling still remains after 3 days or if you develop pain or fever you will heve to get it examined.
Otherwise there is no requirement for medications and you can wait it out till the area returns to normal.
Refrain from injuring the region further till the swelling clears up.
ref:http://womenshealth.about.com/cs/azhealthtopics/a/vulvitissymtrtr.htm